cardiovascular system

functions of the cardiovascular system

Your cardiovascular system has many jobs. At times the cardiovascular system can work like a pump, a heating system, or even a postal carrier. To do these tasks, your cardiovascular system works with other organ systems, such as the respiratory, endocrine, and nervous systems. The cardiovascular system (Figure 1.1) is made up of the heart, the blood vessels, and the blood. It moves nutrients, gases (like oxygen), and wastes to and from your cells. Every cell in your body depends on your cardiovascular system. If your cells dont receive nutrients, they cannot survive. The main function of the cardiovascular system is to deliver oxygen to each of your cells. Blood receives oxygen in your lungs (the main organs of the respiratory system) and then is pumped, by your heart, throughout your body. The oxygen then diffuses into your cells, and carbon dioxide, a waste product of cellular respiration, moves from your cells into your blood to be delivered back to your lungs and exhaled. Each cell in your body needs oxygen, as oxygen is used in cellular respiration to produce energy in the form of ATP. Without oxygen, lactic acid fermentation would occur in your cells, which can only be maintained for a brief period of time. Arteries carry blood full of oxygen ("oxygen-rich") away from the heart and veins return oxygen-poor blood back to the heart. The cardiovascular system also plays a role in maintaining body temperature. It helps to keep you warm by moving warm blood around your body. Your blood vessels also control your body temperature to keep you from getting too hot or too cold. When your brain senses that your body temperature is increasing, it sends messages to the blood vessels in the skin to increase in diameter. Increasing the diameter of the blood vessels increases the amount of blood and heat that moves near the skins surface. The heat is then released from the skin. This helps you cool down. What do you think your blood vessels do when your body temperature is decreasing? The blood also carries hormones, which are chemical messenger molecules produced by organs of the endocrine system, through your body. Hormones are produced in one area of your body and have an effect on another area. To get to that other area, they must travel through your blood. An example is the hormone adrenaline, produced by the adrenal glands on top of the kidneys. Adrenaline has multiple effects on the heart (it quickens the heart rate), on muscles and on the airway.


instructional diagrams

No diagram descriptions associated with this lesson


hormones travel around your body in your blood.

-->  a. true

b. false

the cardiovascular system removes oxygen from your cells.

a. true

-->  b. false

oxygen diffusing into the blood involves which two organ systems?

a) the cardiovascular and the endocrine systems

-->  b) the cardiovascular and the respiratory systems

c) the cardiovascular and the nervous systems

d) the endocrine and the respiratory systems

what is the effect of adrenaline on the heart?

-->  a) adrenaline increases the heart rate.

b) adrenaline decreases the heart rate.

c) adrenaline has no effect on the heart rate.

d) adrenaline maintains the hearts temperature.

which statement describes the movement of oxygen-rich blood?

a) veins carry oxygen-rich blood away from the heart.

-->  b) arteries carry oxygen-rich blood away from the heart.

c) arteries carry oxygen-rich blood back to the heart.

d) none of the above

what are examples of cardio activities?

a) rowing and running

b) biking

c) swimming and skiing (cross-country)

-->  d) all of the above are cardio activities.

what is the main function of the cardiovascular system?

a) the main function of the cardiovascular system is to deliver carbon dioxide to each of your cells.

b) the main function of the cardiovascular system is to remove oxygen from each of your cells.

-->  c) the main function of the cardiovascular system is to deliver oxygen to each

d) the main function of the cardiovascular system is to remove carbon dioxide from each of your cells.

diagram questions

No diagram questions associated with this lesson