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Question

Select the incorrect statement about pumping of blood by the human heart:

A
Carbon dioxide-rich blood is sent to the heart by all the organs.
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B
Oxygenated and deoxygenated blood are separated.
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C
Deoxygenated blood is the same as carbon dioxide rich blood.
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D
Carbon dioxide-rich blood is sent to the heart by the lungs.
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Solution

The correct option is D Carbon dioxide-rich blood is sent to the heart by the lungs.
Oxygenated blood flows only in the left side of the heart, and deoxygenated blood, which is also carbon dioxide-rich, flows through the right side of the heart. Oxygenated blood reaches the heart from the lungs, which is then pumped to the body organs. Deoxygenated blood comes to the heart from all parts of the body, to be pumped to the lungs for oxygenation and removal of carbon dioxide.

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