blood vessels

pulmonary circulation

Pulmonary circulation is the part of the cardiovascular system that carries oxygen-poor blood away from the heart and brings it to the lungs. Oxygen-poor blood returns to the heart from the body and leaves the right ventricle through the pulmonary arteries, which carry the blood to each lung. Once at the lungs, the red blood cells release carbon dioxide and pick up oxygen when you breathe. The oxygen-rich blood then leaves the lungs through the pulmonary veins, which return it to the left side of the heart. This completes the pulmonary cycle. The oxygenated blood is then pumped to the body through systemic circulation, before returning again to pulmonary circulation.

important arteries and veins

There are specific veins and arteries that are more significant than others. The pulmonary arteries carry oxygen- poor blood away from the heart to the lungs. These are the only arteries that carry oxygen-poor blood. The aorta is the largest artery in the body. It carries oxygen-rich blood away from the heart. Further away from the heart, the aorta branches into smaller arteries, which eventually branch into capillaries. Capillaries are the smallest type of blood vessel; they connect very small arteries and veins. Gases and other substances are exchanged between cells and the blood across the very thin walls of capillaries. The veins that return oxygen-poor blood to the heart are the superior vena cava and the inferior vena cava. The pulmonary veins return oxygen-rich blood from the lungs to the heart. The pulmonary veins are the only veins that carry oxygen-rich blood.

systemic circulation

Systemic circulation is the part of the cardiovascular system that carries oxygen-rich blood away from the heart, to the body, and returns oxygen-poor blood back to the heart. Oxygen-rich blood leaves the left ventricle through the aorta. Then it travels to the bodys organs and tissues. The tissues and organs absorb the oxygen through the capillaries. Oxygen-poor blood is collected from the tissues and organs by tiny veins, which then flow into bigger veins, and, eventually, into the inferior vena cava and superior vena cava. This completes systemic circulation. The blood releases carbon dioxide and gets more oxygen in pulmonary circulation before returning to systemic circulation. The inferior vena cava returns blood from the body. The superior vena cava returns blood from the head.

blood vessels and blood circulation

The blood vessels are an important part of the cardiovascular system. They connect the heart to every cell in the body. Arteries carry blood away from the heart, while veins return blood to the heart ( Figure 1.1). The right side of the heart pumps de- oxygenated blood into pulmonary circula- tion, while the left side pumps oxygenated blood into systemic circulation.

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instructional diagrams

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questions

arteries return blood-rich oxygen to the heart.

a. true

-->  b. false

all arteries carry oxygen-rich blood.

a. true

-->  b. false

what is the name of the largest artery?

a) the pulmonary artery

-->  b) the aorta

c) the superior artery

d) the big artery

what is the name of the valve between the right ventricle and the pulmonary artery?

a) tricuspid valve

b) aortic valve

-->  c) pulmonary valve

d) mitral valve

which occurs during the pulmonary cycle?

a) red blood cells release carbon dioxide and pick up oxygen.

b) oxygen-poor leaves the right ventricle through the pulmonary arteries.

c) oxygen-rich blood returns to the heart through the pulmonary veins.

-->  d) all of the above are part of the pulmonary cycle.

where does gas exchange occur?

-->  a) gas exchange occurs between cells and the blood across the thin walls of

b) gas exchange occurs between cells and the blood across veins and arteries.

c) gas exchange occurs between cells and the blood across the pulmonary artery.

d) all of the above.

which blood vessel returns oxygen from the body to the heart?

a) the superior vena cava

-->  b) the inferior vena cava

c) the aorta

d) the inferior artery

diagram questions

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