the muscular system

a closer look at skeletal muscles

The human body has more than 600 skeletal muscles. You can see some of them in Figure 16.18. A few of the larger muscles are labeled in the figure.

structure and function of skeletal muscles

You can see the bundles of muscle fibers that make up a skeletal muscle in Figure 16.19. You can also see in the figure how the muscle is attached to a bone by a tendon. Tendons are tough connective tissues that anchor skeletal muscles to bones throughout the body. Many skeletal muscles are attached to the ends of bones where they meet at a joint. The muscles span the joint and connect the bones. When the muscles contract, they pull on the bones, causing them to move.

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keeping your muscular system healthy

Did you ever hear the saying, Use it or lose it? Thats certainly true when it comes to muscles. If you dont exercise your muscles, they will actually shrink in size. They will also become weaker and more prone to injury.

skeletal muscles work in pairs

Muscles can only contract. They cant actively lengthen. Therefore, to move bones back and forth at a joint, skeletal muscles must work in pairs. For example, the bicep and triceps muscles of the upper arm work as a pair. You can see how this pair of muscles works in Figure 16.20. When the bicep muscle contracts, it bends the arm at the elbow. When the triceps muscle contracts, it straightens the arm.

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preventing muscle injuries

You are less likely to have a muscle injury if you exercise regularly and have strong muscles. Stretching also helps prevent muscle injuries. Stretching improves the range of motion of muscles and tendons at joints. You should always warm up before stretching or doing any type of exercise. Warmed-up muscles and tendons are less likely to be injured. One way to warm up is to jog slowly for a few minutes.

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keeping muscles strong

Exercising muscles increases their size, and bigger muscles have greater strength. What type of exercises should you do? For all-round muscular health, you should do two basic types of exercise. To increase the size and strength of skeletal muscles, you need to make these muscles contract against a resisting force. For example, you can do sit-ups or pushups, where the resisting force is your own body weight. You can see another way to do it in Figure 16.21. To exercise cardiac muscle and increase muscle endurance, you need to do aerobic exercise. Aerobic exercise increases the size and strength of muscles in the heart and helps all your muscles develop greater endurance. This means they can work longer without getting tired. Aerobic exercise is any exercise such as running, biking, or swimming that causes an increase in your heart rate. You can see another example of aerobic exercise in Figure 16.22. Lifting weights is one way to pit skeletal muscles against a resisting force. Snowshoeing is a fun way to get aerobic exercise.

how a muscle contracts

To understand how a muscle contracts, you need to dive deeper into the structure of muscle fibers. You can see in Figure 16.16 that a muscle fiber is full of myofibrils. Each myofibril is made up of two types of proteins, called actin and myosin. These proteins form thread-like filaments. The myosin filaments use energy from ATP to pull on the actin filaments. This causes the actin filaments to slide over the myosin filaments and shorten a section of the myofibril. You can see a simple animation of the process at this link: http://commons.wikimedia.org/wiki/File:Actin_Myosin.gif The sliding-and-shortening process occurs all along many myofibrils and in many muscle fibers. It causes the muscle fibers to shorten and the muscle to contract.

types of muscle tissue

There are three different types of muscle tissue in the human body: cardiac, smooth, and skeletal muscle tissues. All three types consist mainly of muscle fibers, but the fibers have different arrangements. You can see how each type of muscle tissue looks in Figure 16.17. Cardiac muscle is found only in the walls of the heart. It is striated, or striped, because its muscle fibers are arranged in bundles. Contractions of cardiac muscle are involuntary. This means that they are not under conscious control. When cardiac muscle contracts, the heart beats and pumps blood. Smooth muscle is found in the walls of other internal organs such as the stomach. It isnt striated because its muscle fibers are arranged in sheets rather than bundles. Contractions of smooth muscle are involuntary. When smooth muscles in the stomach contract, they squeeze food inside the stomach. This helps break the food into smaller pieces. Skeletal muscle is attached to the bones of the skeleton. It is striated like cardiac muscle because its muscle fibers are arranged in bundles. Contractions of skeletal muscle are voluntary. This means that they are under conscious control. Whether you are doing pushups or pushing a pencil, you are using skeletal muscles. Skeletal muscles are the most common type of muscles in the body. You can read more about them below.

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what are muscles

Muscles are the main organs of the muscular system. Muscles are composed primarily of cells called muscle fibers. A muscle fiber is a very long, thin cell, as you can see in Figure 16.16. It contains multiple nuclei and many mitochondria, which produce ATP for energy. It also contains many organelles called myofibrils. Myofibrils allow muscles to contract, or shorten. Muscle contractions are responsible for virtually all the movements of the body, both inside and out.

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instructional diagrams

description_image

The diagram shows the huma's body muscular system. Most muscles are attached to bones with tendons. Many muscles derive their name from their anatomical region. For example, the Rectus Abdominis is found in the abdominal region. Other muscles, like the Tibialis Anterior are named after the bone they are attached to, in this case the tibia. Other muscles are classified by form. The Deltoid have a delta or a triangular shape.

description_image

This diagram shows the structure of human back. The human back is the large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. It is the surface opposite to the chest, its height being defined by the vertebral column (commonly referred to as the spine or backbone) and its breadth being supported by the ribcage and shoulders. The spinal canal runs through the spine and provides nerves to the rest of the body. Trapezius is either of a pair of large triangular muscles extending over the back of the neck and shoulders and moving the head and shoulder blade. The triceps brachii muscle is the large muscle on the back of the upper limb of many vertebrates. The latissimus dorsi of the back is the larger, flat, dorso-lateral muscle on the trunk, posterior to the arm. Gluteus is any of three muscles in each buttock which move the thigh, the largest of which is the gluteus maximus.

description_image

The diagram shows the entire muscular system of the human body. Muscles are the main organs of the muscular system. Their main function is movement of the body. Muscles are the only tissue in our bodies that can contract and therefore move the other parts of the body. They are composed primarily of muscle fibers. Many muscles derive their name from their anatomical region. The rectus abdominis, for example, is found in the abdominal region. A function of the muscular system is to produce body heat. As a result of contraction, our muscular system produces waste heat.

description_image

This diagram depicts the structure of muscle cells. Muscle cells are also known as muscle fibers. The diagram illustrates components such as striated myofibrils, which is exclusive to that kind of cell. Myofibrils consist of filaments. There are thin filaments and thick filaments. Each cell is covered by a plasma membrane sheath which is called the sarcolemma. Tunnel-like extensions from the sarcolemma pass through the muscle fibre from one side of it to the other in transverse sections through the diameter of the fibre. The cell contains sarcoplasm, which is the cytoplasm of muscle cells.

description_image

This diagram represents the structure of a skeletal muscle. Each skeletal muscle fiber is a single cylindrical muscle cell. Each muscle is surrounded by a connective tissue sheath called the epimysium. Fascia, connective tissue outside the epimysium, surrounds and separates the muscles. Portions of the epimysium project inward to divide the muscle into compartments. Each compartment contains a bundle of muscle fibers. Each bundle of muscle fiber is called a fasciculus and is surrounded by a layer of connective tissue called the perimysium. Within the fasciculus, each individual muscle cell, called a muscle fiber, is surrounded by connective tissue called the endomysium. The connective tissue covering furnish support and protection for the delicate cells and allow them to withstand the forces of contraction. The coverings also provide pathways for the passage of blood vessels and nerves. Commonly, the epimysium, perimysium, and endomysium extend beyond the fleshy part of the muscle, the belly or gaster, to form a thick ropelike tendon or a broad, flat sheet-like aponeurosis. The tendon and aponeurosis form indirect attachments from muscles to the periosteum of bones or to the connective tissue of other muscles.

questions

To straighten your arm at the elbow, you would contract the

a. quadriceps muscle.

b. biceps muscle.

-->  c. triceps muscle.

d. elbow muscle.

__organelle that allows muscles to contract

a. actin

b. cardiac muscle

c. smooth muscle

d. muscle fiber

e. tendon

-->  f. myofibril

g. skeletal muscle

__muscle found in the walls of internal organs except the heart

a. actin

b. cardiac muscle

-->  c. smooth muscle

d. muscle fiber

e. tendon

f. myofibril

g. skeletal muscle

Smooth muscle is

a. arranged in bundles.

b. striped.

-->  c. involuntary.

d. two of the above

The energy for a muscle contraction comes from

a. actin.

b. myosin.

-->  c. ATP.

d. myofibrils.

__tough connective tissue that attaches muscle to bone

a. actin

b. cardiac muscle

c. smooth muscle

d. muscle fiber

-->  e. tendon

f. myofibril

g. skeletal muscle

__long, thin muscle cell

a. actin

b. cardiac muscle

c. smooth muscle

-->  d. muscle fiber

e. tendon

f. myofibril

g. skeletal muscle

Which statement about cardiac muscle is false?

a. It causes the heart to beat.

-->  b. It is under conscious control.

c. It is striated muscle.

d. none of the above

__muscle found in the walls of the heart

a. actin

-->  b. cardiac muscle

c. smooth muscle

d. muscle fiber

e. tendon

f. myofibril

g. skeletal muscle

Skeletal muscles are attached to bones by

a. ligaments.

b. cartilage.

c. muscle fibers.

-->  d. tendons.

__protein filament that slides over another when a muscle contracts

-->  a. actin

b. cardiac muscle

c. smooth muscle

d. muscle fiber

e. tendon

f. myofibril

g. skeletal muscle

__most common type of muscle in the body

a. actin

b. cardiac muscle

c. smooth muscle

d. muscle fiber

e. tendon

f. myofibril

-->  g. skeletal muscle

The human heart is composed almost completely of muscle.

-->  a. true

b. false

When a muscle contracts, it gets longer.

a. true

-->  b. false

Actin filaments slide over myosin filaments when a muscle contracts.

-->  a. true

b. false

Contractions of skeletal muscles are involuntary.

a. true

-->  b. false

Weight-bearing exercises increase muscle strength.

-->  a. true

b. false

Each muscle fiber contains many

a. nuclei.

b. mitochondria.

c. myofibrils.

-->  d. all of the above

Cardiac muscle is

-->  a. striated.

b. arranged in sheets.

c. under conscious control.

d. all of the above

Which statement about smooth muscle is true?

a. It is arranged in bundles.

b. Its contractions are voluntary.

-->  c. It is needed for the digestion of food.

d. It is found in the walls of all internal organs.

How many skeletal muscles are there in the human body?

a. fewer than 60

b. about 160

c. about 320

-->  d. more than 600

A single muscle can

-->  a. only contract.

b. actively lengthen.

c. move a bone back and forth.

d. two of the above

The name of the muscle that bends the arm at the elbow is the

-->  a. biceps muscle.

b. elbow muscle.

c. triceps muscle.

d. upper arm muscle.

Which form(s) of exercise would increase the strength of cardiac muscle?

a. running

b. biking

c. weight lifting

-->  d. two of the above

There are four different types of muscle tissues in the human body.

a. true

-->  b. false

Aerobic exercise increases muscle endurance.

-->  a. true

b. false

Tendons attach one bone to another at a joint.

a. true

-->  b. false

Skeletal muscles work in pairs.

-->  a. true

b. false

The quadriceps is a muscle in the upper arm.

a. true

-->  b. false

Sit-ups and pushups increase muscle size and strength.

-->  a. true

b. false

Muscle contractions are responsible for virtually all movements of the body.

-->  a. true

b. false

diagram questions

question_image

Identify the quadriceps in this picture

a. P

b. F

c. S

-->  d. W

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Which label shows the Trapezius?

a. Y

b. S

c. A

-->  d. P

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Where are the pectorals?

a. S

-->  b. F

c. Y

d. R

question_image

Which label shows the triceps?

a. X

b. R

-->  c. U

d. K

question_image

Which muscles are the triceps?

a. J

-->  b. U

c. K

d. R

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Which letter represents triceps?

a. H

b. N

c. M

-->  d. U

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What is the corresponding label for the pectoralis major?

a. Y

b. C

-->  c. E

d. A

question_image

What is the Muscle of the Body Labeled M?

a. OBLIQUE

b. BICEPS

c. SOLEUS

-->  d. TRAPEZIUS

question_image

This muscle belongs to the Pes anserinus (Goose foot). Which?

a. GASTROCNEMIUS

b. ADUCTOR LONGUS

c. TIBIALIS

-->  d. GRACILIS

question_image

Select the trapezius muscle.

-->  a. M

b. N

c. A

d. E

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The label P refers to which muscle?

a. GRACILIS

b. BICEPS BRACHII

-->  c. DELTOID

d. TEMPORALIS

question_image

Identify the deltoid in the following images:

a. N

-->  b. U

c. P

d. V

question_image

Which letter is used to label the Tibialis Anterior?

a. A

-->  b. V

c. J

d. E

question_image

Select the antagonist of the pectoralis major muscle.

a. D

b. T

c. S

-->  d. U

question_image

Where is the deltoid?

-->  a. U

b. X

c. N

d. K

question_image

Identify the frontalis

a. A

b. R

c. U

-->  d. T

question_image

What is N in this image of the human muscular system?

a. FRONTALIS

b. GRACILIS

-->  c. SARTORIUS

d. DELTOID

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Which muscle has an insertion in the sternum and in the brachial incisure of the umerus?

a. D

b. X

-->  c. F

d. P

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Which letter represents the brachialis?

-->  a. M

b. A

c. X

d. W

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Where is the deltoid?

a. V

-->  b. H

c. P

d. M

question_image

What is C?

a. BICEPS BRACHII

-->  b. BRACHIORADIALIS

c. ROTATOR CUFF

d. BRACHIALIS

question_image

Can you identify the gluteus maximus?

a. J

b. F

c. E

-->  d. P

question_image

Which label marks the deltoid muscle?

a. E

b. Y

c. M

-->  d. K

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Which muscle is the tibialis anterior?

a. A

-->  b. T

c. R

d. U

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Which of the following labels identifies the adductor muscles?

a. T

b. R

c. A

-->  d. F

question_image

What letter represents the muscle fiber?

a. S

b. P

c. W

-->  d. X

question_image

Which label shows the tendon?

-->  a. J

b. H

c. W

d. X

question_image

What is X in this image of the structure of a skeletal muscle?

a. BONE

b. TENDON

c. BLOOD VESSEL

-->  d. MUSCLE FIBER

question_image

If part J is removed, what happens?

-->  a. THE MUSCLE LOSES CONNECTION TO THE BONE.

b. THE MUSCLE STRENGTH INCREASES.

c. THE MUSCLE WRAPS AROUND THE BONE.

d. THE MUSCLE MASS INCREASES.

question_image

Which label identifies the muscle?

-->  a. P

b. Y

c. A

d. E

question_image

Which letter indicates the muscle fiber?

-->  a. Y

b. E

c. A

d. P

question_image

What kind of fibers do you see in the picture (letter Y)?

a. BONE MARROW

b. CARTILAGE

c. DIGESTIVE SYSTEM FIBERS

-->  d. MUSCLE FIBERS

question_image

Which label identifies the tendon?

a. X

b. E

-->  c. F

d. R

question_image

Which label refers to the bone?

-->  a. M

b. X

c. E

d. A

question_image

Which label represents the bone?

a. V

-->  b. F

c. H

d. R

question_image

Which label represents the perimysium?

a. T

b. W

-->  c. A

d. H

question_image

What connects the muscle to the bone?

a. MITOCHONDRION

-->  b. TENDON

c. FIBER

d. TISSUE

question_image

By what letter is the muscle fiber represented in the diagram?

-->  a. K

b. A

c. N

d. J

question_image

What connects the muscle and the bone?

a. EXTRA BONES

b. MUSCLE FIBERS

-->  c. TENDON

d. FIBERS

question_image

Which label represents the myelin sheath?

-->  a. R

b. X

c. Y

d. S

question_image

Which label shows the Myelin sheath?

a. A

-->  b. R

c. Y

d. X

question_image

Which label refers to the bone?

a. T

b. W

-->  c. D

d. U

question_image

Which label shows the fascicle?

a. D

b. U

-->  c. N

d. R

question_image

Which letter represents a blood vessel?

a. D

b. U

-->  c. T

d. W

question_image

Which structure nourishes the muscle?

a. E

b. W

c. U

-->  d. T

question_image

Which represents the tough connective tissues that anchor skeletal muscles to bones throughout the body?

a. U

-->  b. E

c. D

d. W

question_image

What is the muscle shown in the arm other than the Biceps?

a. Frontalis

-->  b. Deltoid

c. Pectoralis

d. Biceps

question_image

How many types of muscles are shown in the image?

a. 3

b. 4

-->  c. 6

d. 5

question_image

Which of the following is located in the arm?

-->  a. Biceps

b. Tibialis anterior

c. Frontalis

d. Quadriceps

question_image

Where is the deltoid muscle located?

a. arm

b. leg

c. head

-->  d. shoulder

question_image

Which muscle group is located in the thigh?

a. Deltoids

-->  b. Quadriceps

c. Pectoralis

d. Frontalis

question_image

In the leg, what are the quadriceps connected to?

a. Biceps

b. Frontalis

c. Deltoid

-->  d. Tibialis anterior

question_image

What is between the Frontalis and the Pectoralis?

a. Tibialis Anterior

b. Biceps

c. Quadriceps

-->  d. Deltoid

question_image

How many muscle groups are there in the body?

a. 5

-->  b. 6

c. 4

d. 7

question_image

In the diagram, how many muscles are located in the upper body?

-->  a. 4

b. 6

c. 5

d. 2

question_image

What are the muscles in the shoulders?

a. Biceps

b. Frontalis

-->  c. Deltoids

d. Quadriceps

question_image

Which of the following is located in the head?

a. Deltoid

b. Pectoralis

-->  c. Frontalis

d. Biceps

question_image

What is the shoulders' major muscle?

a. Teres major

b. Sternocleidomastoid

-->  c. Deltoid

d. Gluteus medius

question_image

What are the main chest muscles?

-->  a. Pectoralis major

b. Gracilus

c. Gluteus medius

d. Deltoid

question_image

What's the name of the muscle that can be found at the shoulder level in the diagram?

a. Iliotibial band

b. Sternocleidomastoid

c. Teres major

-->  d. Deltoid

question_image

Which muscle is connected to the deltoid?

a. pectineus

b. peroneus longus

-->  c. pectoralis major

d. iliopsoas

question_image

How many anterior muscles are located below the knee?

-->  a. 5

b. 4

c. 8

d. 6

question_image

How many muscles in the torso area?

a. 8

b. 10

-->  c. 9

d. 7

question_image

Which muscle is used for chewing food?

a. Deltoids

b. Biceps

-->  c. Masseter

d. Pectorals

question_image

What are the chest muscles called?

-->  a. Pectorals

b. Triceps

c. Quadriceps

d. Biceps

question_image

What do you call the muscles located in the upper leg and located in front of the leg biceps?

-->  a. quadriceps

b. pectorals

c. masseter

d. triceps

question_image

How many leg muscles are labelled in the diagram?

-->  a. 3

b. 4

c. 2

d. 1

question_image

How many muscles are shown in this picture?

-->  a. 10

b. 8

c. 9

d. 7

question_image

What are the buttocks known as?

a. Spine

b. Sacrospinalis

c. Vertebrae

-->  d. Gluteus Maximus

question_image

Which muscle is connected to the trapezius?

a. plantaris

b. teres minor

c. soleus

-->  d. deltoid

question_image

Which muscle is located closest to the neck?

a. The deltoid

b. The trapezius

-->  c. The sternocleidomastoid

d. The chest muscles

question_image

How many major posterior muscles in the diagram are located below the waist?

-->  a. Thirteen

b. Seventeen

c. Ten

d. Nine

question_image

How many muscles can be found in the lower legs?

a. 9

b. 5

c. 7

-->  d. 3

question_image

Which muscles flex the knee?

a. Occipitalis

-->  b. Hamstrings

c. Deltoid

d. Trapezius

question_image

Which of the following is the calf muscle located above the Achilles tendon?

a. Extensors

b. Trapezius

-->  c. Soleus

d. Hamstrings

question_image

Which of these muscles help to raise the arm?

a. Latissimus dorsi

-->  b. Deltoid

c. Triceps brachii

d. Extensors

question_image

How many parts of the muscular system are being identified in the diagram?

a. 11

b. 9

c. 10

-->  d. 12

question_image

What happens when the hamstrings contract?

a. it will cause the bone to break

b. it will stay in place

c. nothing

-->  d. they pull on the bones, causing them to move.

question_image

What are the muscles at the base of the neck called?

a. Teres

b. Deltoid

c. Triceps

-->  d. Trapezius

question_image

What are the muscles located in the head called?

a. teres

b. deltoids

c. trapezius

-->  d. occipitalis

question_image

How many muscles are there in the back of the head?

a. 2

b. 4

c. 3

-->  d. 1

question_image

Where is the frontalis?

a. stomache

b. shoulders

c. arm

-->  d. forehead

question_image

Which part helps in is plantarflexion of the foot?

a. Deltoid

-->  b. Soleus

c. Frontalis

d. Biceps

question_image

How many muscles are in the arm?

a. 3

-->  b. 4

c. 1

d. 2

question_image

Extensor muscles make up what part of the body?

a. feet

b. arms

c. head

-->  d. legs

question_image

What is a muscle neither parallel nor perpendicular to the long axis of a body or limb?

-->  a. Oblique

b. Deltoid

c. Biceps

d. Trapezius

question_image

How is called the bottom muscle depicted in the diagram?

a. Deltoid

-->  b. Soleus

c. Latissimus doris

d. Temporalis

question_image

Where are the triceps brachii?

a. In the back of the leg

b. On the shoulder

c. In the front of the leg

-->  d. In the back of the arm

question_image

How many muscles make up the rectus abdominis?

a. 2

-->  b. 8

c. 6

d. 4

question_image

How many soleuses are there?

a. 1

-->  b. 3

c. 2

d. 5

question_image

Brachioradialis makes up what part of the body?

a. leg

-->  b. arm

c. shoulder

d. foot

question_image

From the diagram, identify which is the longest muscle in the human body.

-->  a. sartorius

b. pectoralis major

c. quadriceps femoris

d. biceps brachii

question_image

Which muscle allows the arm to bend?

a. Rectus abdominis

-->  b. Biceps brachii

c. Quadriceps femoris

d. Pectoralis major

question_image

Which of these muscles is at the top?

a. rectus abdominis

-->  b. temporalis

c. sartorius

d. biceps brachii

question_image

How many types of skeletal muscles do you see in the diagram?

a. 2

b. 3

-->  c. 7

d. 5

question_image

How many muscles are shown in this picture?

a. 4

b. 5

c. 6

-->  d. 7

question_image

If you moved your arm which muscles would you use?

a. Sartorius

-->  b. Biceps brachil

c. Rectus abdominis

d. Temporalis

question_image

Pectoralis major makes up what part of the body?

a. arms

-->  b. chest

c. hands

d. legs

question_image

The muscles in the cheeks are called?

-->  a. Zygomaticus

b. frontalis

c. trapezius

d. deltoid

question_image

How many muscles are in the thigh?

a. 6

b. 3

c. 4

-->  d. 5

question_image

The deltoid makes up what part of the body?

a. hand

b. arm

c. leg

-->  d. shoulder

question_image

The brachialis is in which part of the human body?

-->  a. arm

b. leg

c. foot

d. shoulder

question_image

What are the muscles located on your calves called?

a. Deltoids

b. Gracilis

c. External oblique

-->  d. Gastrocnemius

question_image

How many types of glutes are there?

a. 5

b. 1

-->  c. 2

d. 8

question_image

Which muscles help the calves to move?

-->  a. Soleus

b. Wrist flexors

c. Teres major

d. External oblique

question_image

What are the muscles called on your inner thighs?

a. quadriceps

b. biceps

-->  c. adductor muscles

d. deltoids

question_image

Which of the following is a calf muscle?

a. Deltoid

b. Brachioradialis

c. Adductor

-->  d. Peroneus longus

question_image

How many muscles below the knee are labeled?

a. 5

b. 6

-->  c. 3

d. 4

question_image

Deltoid makes up what part of the body?

a. arms

b. hands

c. legs

-->  d. shoulder

question_image

What happens if you hurt your biceps brachii?

-->  a. You will not be able to bend your arm at the elbow.

b. You will not be able sit down.

c. You will not be able to lift your leg.

d. You will not be able to roll your shoulder.

question_image

Which of these is connected to the deltoid?

a. tibialis posterior

b. latissimus dorsi

c. gluteus maximus

-->  d. trapezius

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Which muscle group is at the shoulders?

-->  a. deltoid

b. biceps femoris

c. gluteus maximus

d. brachioradialis

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Which of the parts of the muscle is composed of actin and myosin?

a. Mitochondria

b. Nucleus

c. Sarcoplasm

-->  d. Myofibrils

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What is the outer layer shown in the diagram?

a. Mitochondria

b. Nucleus

-->  c. Sarcolemma

d. Sarcoplasm

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What is inside Muscle Fasciculus?

a. smooth muscle

-->  b. Muscle Fiber

c. skeletal muscle

d. Muscle

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How many parts are shown in the picture?

-->  a. 3

b. 1

c. 4

d. 2

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From the diagram, identify the part which refers to a sheath of connective tissue surrounding a bundle of muscle fibers.

a. endomysium

b. blood vessel

-->  c. perimysium

d. epimysium

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What does a fascicle consist of?

a. epimysium

-->  b. muscle fiber

c. blood vessel

d. perimysium

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What is wrapped by perimysium?

a. Endomysium

b. Muscle Fiber

-->  c. Fascicle

d. Epimysium

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If the tendon is removed, what happens?

-->  a. The muscle loses connection to the bone.

b. The muscle wraps itself around the bone.

c. The muscle looses mass.

d. The muscle's strength increases.

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What is attached to the tendon?

a. blood vessel

b. epimysium

-->  c. bone

d. muscle fiber

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This is a diagram of a muscle fiber. Muscle fibers contain many what?

a. sarcoplasm

b. mitochondria

c. glial cells

-->  d. myofibril

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How many nuclei are there?

-->  a. 1

b. 2

c. 4

d. 3

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What are the blue tubes in the diagram called?

a. mitochondria

b. glial cell

c. sarcolemma

-->  d. transverse tubules

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What attaches the muscle to the bone?

a. epimtsium

b. endomysium

c. perimysium

-->  d. tendon

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It is the tough band of fibrous connective tissue and functions to connect muscle to bone. It is capable of withstanding tension

-->  a. Tendon

b. Perimysium

c. Epimysium

d. Muscle Fiber

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What connects the muscle with the muscle fibers?

a. Tendon

-->  b. Fasciculus

c. Epimysium

d. Endomysium

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Which structure attaches the muscle to bone?

-->  a. Tendon

b. Epimysium

c. Endomysium

d. Fasciculus

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How many muscle parts are represented in the diagram?

a. 5

b. 3

c. 6

-->  d. 8

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Identify the tissue which connects muscle fibers to the bones.

a. Bone

b. Ligament

-->  c. Tendon

d. Muscle fiber

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What is the base to which muscles attach?

a. nerves

b. tendons

-->  c. Bone

d. fibers

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How many of these structures function as tough connective tissues that anchor skeletal muscles to bones throughout the body?

a. 2

-->  b. 1

c. 3

d. 0

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What attaches the muscle to the bone?

a. muscle fiber

b. patella

-->  c. tendon

d. ligament

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What is the function of tendons?

a. Contract muscles

b. Protect bones

-->  c. Pull the bones and cause the joints to move

d. Move bones

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Which of the following is full of myofibrils?

-->  a. Muscle fibers

b. Neuromuscular junctions

c. Schwann cell

d. Myelin sheath

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What are muscle fibers made up of?

a. Skeletal muscle

b. Myelin

-->  c. Myofibrils

d. Schwann cells

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Which part of the muscle fibers allow the muscles to contract?

-->  a. Myofibrils

b. Motor neuron

c. Myelin sheath

d. Neuromuscular junctions

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How many parts is motor neuron made of?

-->  a. 3

b. 2

c. 1

d. 4

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How many parts of the diagram are there?

a. 7

-->  b. 6

c. 5

d. 4

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What makes up the motor neuron?

a. skeletal muscle

b. neuromuscular juntions

-->  c. schwann cell, myelin sheath

d. muscle fibers

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Identify what connects the muscle to the bone

a. Perimysium

b. Blood vessel

c. Muscle fiber

-->  d. Tendon

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What are the connective tissues that anchor skeletal muscles to bones?

a. Muscle fiber

b. Epimysium

-->  c. Tendon

d. Fascicle

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What is the innermost part of the structure?

a. Bone

b. Fascicle

c. Tendon

-->  d. Muscle fiber

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What attaches the muscle to the bone?

a. epimysium

-->  b. tendon

c. fascicle

d. muscle fiber

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What part is responsible for connecting muscle tissue to bone?

a. Perimysium

b. Epimysium

-->  c. Tendon

d. Muscle fiber

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Identify the deltoids

a. H & W

b. N & P

-->  c. U & P

d. S & D

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Identify deltoid

a. M

b. T

c. A

-->  d. H