Question

Describe the mechanism of circulation of blood?

Answer 1

Circulation of blood:

1. Blood is the fluid connective tissue of our body.
2. Blood flows through pipe-like channels called blood vessels.
3. The heart is a portion of the vascular system, consisting of a compact but hollow mass of muscle that acts rhythmically as a pump and owing to the presence of valves suitably placed, drives the blood in one constant direction through the body.
4. The deoxygenated blood from various body parts reaches the right atrium through two veins called superior and inferior vena cava.
5. this blood rushes to the right ventricle by the auricular contraction.
6. From the right ventricle, blood reaches lungs through pulmonary artery.
7. Gaseous exchange takes place in the lungs and deoxygenated blood converts to oxygenated blood.
8. This oxygenated blood reaches left atrium through pulmonary vein.
9. Blood is transferred to the left ventricle and is distributed to all body parts through aorta.
10. Although the circulatory system is made up of two cycles, both happen at the same time.
11. The contraction of the heart muscle starts in the two atria, which push the blood into the ventricles. Then the walls of the ventricles squeeze together and force the blood out into the arteries.
12. Afterward, the heart muscle relaxes, allowing blood to flow in from the veins and fill the atria again.