Question

Explain how blood is circulated in the body.

Answer 1

Blood circulation can be understood through the following steps:

1. Deoxygenated blood from different parts of the body enters the left auricle of the heart through the superior and inferior vena cava.
2. From the right auricle, the blood is pumped into the right ventricle; from there, it is pumped to the lungs for oxygenation through the pulmonary artery.
3. After oxygenation in the lungs, blood returns to the left auricle of the heart through the pulmonary vein.
4. From the left auricle, the blood enters the left ventricle, and it is then pumped to all parts of the body through the aorta.
5. The aorta branches into major arteries, minor arteries and, finally, capillaries as it enters tissues.
6. The blood in the capillaries delivers nutrients and oxygen to the tissues and picks up carbon dioxide and waste products.
7. The wastes are filtered out in the kidneys and the deoxygenated blood returns to the right auricle. This cycle is repeated through out the life of an individual.