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| 1. |
Describe the mechanilism of bloood circulism through human heart |
| Answer» The heart is the major organ of our body which\xa0continuously pumps oxygen and nutrient-rich blood\xa0throughout our body to sustain life.\xa0As the heart\xa0beats, it pumps blood through a system of blood vessels, called the circulatory system.\xa0The blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve. When the ventricle is full, the tricuspid valve shuts. This prevents blood from flowing backward into the right atrium while the ventricle contracts. As the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs, where it is oxygenated. The oxygenated blood then returns to the heart through the pulmonary veins. And finally, the oxygenated blood from the left ventricle is pumped through the aorta to the whole body. | |