Human heart is made up of how many chambers?

Question

UnlockIAS · Accepted Answer

Correct — D, Only four. The human heart has four chambers: two upper chambers called atria (the right atrium and left atrium) that receive blood, and two lower chambers called ventricles (the right ventricle and left ventricle) that pump it out. The right side handles deoxygenated blood and sends it to the lungs, while the left side handles oxygenated blood and pumps it to the body. This four-chambered plan, shared by birds and mammals, keeps oxygenated and deoxygenated blood fully separated (double circulation).

Why the other options are wrong — (a) A three-chambered heart (two atria and one ventricle) is found in amphibians and most reptiles, not in humans.  (b) A two-chambered heart (one atrium and one ventricle) is characteristic of fishes, not humans.  (c) No vertebrate, and certainly not a human, has a truly single-chambered heart.

Concept: The human heart is a four-chambered muscular pump. The two atria receive incoming blood and the two ventricles pump blood out; the left ventricle, which pushes blood to the whole body, has the thickest wall. Separating the four chambers allows oxygenated and deoxygenated blood streams to stay apart, supporting efficient double circulation.

State PCS 2023 Q89 — Science & Technology PYQ with Answer

State PCS 2023 Q89 — Science & Technology PYQ with Answer