Name: Complex Tissues (Xylem and Phloem)
Uploaded: 2019-07-19
Duration: 6 min 10 s
Description: The average height of a coconut tree is 30 m. How does a coconut tree move water from its roots to the very tips of its leaves? Is it magic, or is it science...

Question

Explain the circulation of blood in human body with the help of a schematic diagram.

Accepted Answer

The blood is circulated in the human body by regular contractions and relaxations of the heart.

Steps involved in blood circulation in the human body:

STEP:1 When blood passes through the capillaries of the lungs, then oxygen from air enters the blood. The blood is now oxygen-rich called oxygenated blood.

STEP:2 The pulmonary vein brings the oxygenated blood from the lungs into the left atrium of the heart. When the left atrium contracts, the oxygenated blood is pushed into the left ventricle.

STEP:3 When the left ventricle contracts, it pumps oxygenated blood into the main artery called aorta. The aorta branches into many arteries which supply oxygenated blood to all the organs of the body (except lungs).

STEP:4 When oxygenated blood from arteries passes through the capillaries of the body organs, then it gives food and oxygen to the body cells. At the same time, carbon dioxide produced as a waste product in the body cells during respiration enters the blood through capillaries.

STEP:5 The deoxygenated blood (rich in carbon dioxide) collected from the body organs enters the right atrium.

STEP:6 When the right atrium contracts, the deoxygenated blood is pushed into the right ventricle.

STEP:7 When the right ventricle contracts, the deoxygenated blood is pumped into the lungs through the pulmonary artery.

STEP:8 In the lungs, deoxygenated blood gives out carbon dioxide and absorbs fresh oxygen from the air, we breathe in. So, the blood becomes oxygenated again.

The schematic diagram of blood circulation in the human body is given below:

Explain the circulation of blood in human body with the help of a schematic diagram.

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