Compare pulmonary circulation and systemic circulation.
Pulmonary and systemic circulation both serve different purposes.
In pulmonary circulation, blood is circulated through the lungs where blood receives oxygen and releases carbon dioxide. Oxygen rich blood then is brought back to the heart and picks up blood with less oxygen to the lungs. In systemic circulation, blood is circulated through the entire body, and releases oxygen while taking in carbon dioxide. The blood then carries the carbon dioxide to the heart, where it picks up oxygen to bring back to body parts.
In pulmonary circulation, blood vessels go through capillaries on the alveoli, where gas exchange occurs in the lungs.
1. Replenishes blood with oxygen from the lungs.
2. Transports deoxygenated blood from the body through the right side of the heart to the lungs. Then returns oxygenated blood to the left side of the heart from the lungs.
3. Blood is transported in the arteries.
How blood moves around by pulmonary circulation. From the right ventricle to the pulmonary artery deoxygenated blood leaves the capillaries and is replaced by oxygen that diffuses out of the alveoli into the blood. This oxygenated blood then via the capillaries enters the pulmonary vein of the heart, where it re-enters at the left atrium.
1. Distributes blood from the heart to the tissues of the body.
2. Transports oxygenated blood from the heart to the body to supply the body with nutrients and oxygen, then carries the deoxygenated blood back to the heart.
3. Blood is transported in the veins.
How blood moves around by systemic circulation. Blood goes to the aorta by way of the left ventricle, then to arterioles and capillaries. Waste and carbon dioxide in cells are carried away by the blood to venous capillaries, and then replaced by oxygen. From the venous capillaries, the deoxygenated blood enters the venae cavae, which is comprised of the lower inferior vena cava and the upper superior vena cava. The blood re-enters the heart at the right atrium though the venae cavae.