Why does the left side of the heart has oxygeneted blood and the right side has deoxygenated blood?

Academic Biology NCERT Class 7

The right side of the heart pumps blood to the lungs to pick up oxygen, i.e. the blood moving towards the lungs is oxygen-poor or deoxygenated. While, the left side of the heart receives the oxygen-rich blood (or oxygenated blood) from the lungs, and pumps it to the body.

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Updated on: 26-Apr-2023

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(a) What are the upper parts of the heart called ?(b) What are the lower parts of the heart called ?(c) What is the name of blood vessels which connect arteries to veins ?(d) (i) Which side of the heart pumps blood into the lungs?(ii) Which side of the heart pumps blood into entire body (except the lungs)?
The human body has an organ A which acts as a double pump. The oxygenated blood coming from the lungs through a blood vessel B enters the upper left chamber C of the double pump. When chamber C contracts, then blood goes into lower left chamber D. The contraction of chamber D forces the blood to go into a blood vessel E which supplies oxygenated blood to all the organs of the body (except the lungs). The deoxygenated blood coming out of the body organs is taken by a blood vessel F to the right upper chamber G of pumping organ. Contraction of chamber G forces the deoxygenated blood into right lower chamber H. And finally the contraction of chamber H sends the deoxygenated blood into lungs through a blood vessel I.
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