The chamber that pumps oxygen rich blood to the body is the

Correct Answer: C

Rationale: The left ventricle (C) pumps oxygen-rich blood into the aorta for systemic circulation. The left atrium (A) fills the left ventricle, the right atrium (B) receives deoxygenated blood, and the right ventricle (D) pumps to the lungs.

Correct Answer: C

Rationale: Stroke volume (C) is the volume pumped per contraction (~70 mL). A is end-diastolic volume, B is end-systolic volume, D is cardiac output.

Correct Answer: D

Rationale: Capillaries are microscopic (A), exchange sites (B), and fed by arterioles (C), but blood flow is slow (D is false, ~0.3 mm/s) to allow exchange.

Correct Answer: C

Rationale: Venous return relies on muscle pump (A), respiratory pump (B), and blood volume (D). Speed of flow (C) is an outcome, not a driver of return.

Correct Answer: B

Rationale: The aorta’s sections from the heart are: ascending aorta, aortic arch, descending aorta (B). A, C, D misorder the sequence.