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Describe the function of the heart.
Human heart is a muscular pumping organ which pumps blood throughout the body. Blood carries carbon dioxide from cells to the lungs for removal and transports oxygen from the lungs to the heart. The heart pumps blood to all the cells of the body.
The working of the human blood circulatory system:
The heart (cardiovascular system), the lungs (pulmonary system), and the arteries, veins, coronary, and portal vessels all make up the human circulatory system (systemic). These systems control the passage of hormones, nutrients, oxygen, and blood to and from the cells.
The four-chambered human heart is a muscular organ. The right and left ventricles and the right and left atrium are the names of the lower two chambers, respectively. It is situated somewhat to the left and behind the breastbone.
The following list of steps in blood circulation:
1. The heart's left atrium receives oxygenated blood from the lungs via the pulmonary vein.
2. Through valve V1, oxygenated blood is pushed into the left ventricle when the left atrium contracts.
3. When the left ventricle contracts, oxygenated blood enters the aorta, the body's main artery. From there, it travels by tiny branches known as arterioles and capillaries to various body sections, excluding the lungs.
4. The bodily cells receive oxygen, food that has been digested, and dissolved substances from the oxygenated blood. Carbon dioxide, a waste product created during respiration, also enters the circulation at this time.
5. Deoxygenated blood carrying carbon dioxide leaves the body tissues and enters the vena cava, the principal vein that returns it to the right atrium of the heart.
6. Through valve V2, deoxygenated blood enters the right ventricle as the right atrium contracts.
7. Deoxygenated blood is returned to the lungs for oxygenation when the right ventricle contracts, entering through the pulmonary artery. The pulmonary vein transports the blood to the left atrium of the heart, where it is oxygenated once more before being circulated throughout the body.
The entire procedure is continually repeated.
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