In the human body, blood flows through a process of double circulation

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In the human body, blood flows through a process of double circulation. Which one of the following statements is true in this regard ?

Oxygenated blood reaches the left side of the heart from the lungs.
Blood in the left side of the heart is poor in oxygen and is brought to the right side of the heart.
Deoxygenated blood from the left side of the heart is brought to the lungs for oxygenation.
Oxygenated blood from the right side of the heart is sent around the body.
This question was previously asked in
UPSC CDS-2 – 2021
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Statement A is true regarding double circulation in the human body. Oxygenated blood returns from the lungs via the pulmonary veins to the left atrium, then enters the left ventricle before being pumped to the rest of the body.
Double circulation involves two separate loops: the pulmonary circulation (heart to lungs and back) and the systemic circulation (heart to the rest of the body and back). The right side of the heart handles deoxygenated blood, while the left side handles oxygenated blood.
Option B is false because blood in the left side of the heart is rich in oxygen. Option C is false because deoxygenated blood from the right side of the heart goes to the lungs. Option D is false because oxygenated blood is pumped from the left side of the heart to the body.

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