SSC MTS EXAM

SSC

BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How does the heart work?
A
It pumps blood first to the lungs, back to the heart and then around the rest of the body.
B
It pumps blood first to the rest of the body, back to the lungs and then to the heart.
C
It pumps blood around the rest of the body, back to the heart and then to the lungs,
D
None of the above
Explanation: 

Detailed explanation-1: -The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve. The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body.

Detailed explanation-2: -The right ventricle pumps the low-oxygen blood to the lungs to pick up a fresh supply of oxygen. The left atrium receives to high-oxygen blood from the lungs and pumps it to the left ventricle. The left ventricle pumps the high-oxygen blood to the rest of the body.

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