ATI RN
NCLEX Practice Questions Cardiovascular System Questions
Question 1 of 5
Cardiac outputs is maximum to:
Correct Answer: A
Rationale: The liver receives the most blood (~1.5 L/min, A), though kidneys (C, ~1.2 L/min) are close. Brain (B, ~0.75 L/min) and heart (D, ~0.25 L/min) get less.
Question 2 of 5
During which of the following periods does the largest volume of blood enter the arteries?
Correct Answer: D
Rationale: Ventricular systole (D) ejects the largest volume into arteries (~70 ml/beat). Diastole (A, B) fills chambers, atrial systole (C) adds ~20% to ventricular filling.
Question 3 of 5
If the sinoatrial node is setting the pace for the heartbeat, it will usually be:
Correct Answer: B
Rationale: The SA node typically sets a resting rate of 70-75 bpm (B) under vagal tone, though its intrinsic rate is ~100 bpm.
Question 4 of 5
Another name for the left AV valve
Correct Answer: B
Rationale: The left AV valve is the mitral valve (B), also called bicuspid. Tricuspid (A) is right AV, pulmonary (C) and aortic (D) are semilunar.
Question 5 of 5
Contraction of vascular muscle that increases resistance to blood flow
Correct Answer: B
Rationale: Vasoconstriction (B) contracts vascular muscle, increasing resistance. Vasodilation (A) decreases it, others (C, D) are cardiac terms.