In response to a decrease in blood pressure, heart rate will ___ and the arterioles will ___

Correct Answer: D

Rationale: Low BP triggers sympathetic activation: heart rate increases and arterioles constrict (D) to raise BP. A, B, C would lower BP further.

Correct Answer: D

Rationale: The heart’s blood supply comes from coronary arteries (not listed), but vasa vasorum (A) supply vessel walls, and coronary flow (C) nourishes the myocardium. D (both A and C) fits best. Vasa nervosum (B) is fictional.

Correct Answer: B

Rationale: CCU typically means coronary care unit (B), specialized for heart conditions like MI. A and D are similar but less specific, C is unrelated.

Correct Answer: D

Rationale: Cardiac output = heart rate × stroke volume (D, ~5 L/min). A, B, and C are incorrect combinations.

Correct Answer: C

Rationale: Cardiac output (L/min) ÷ heart rate (bpm) = stroke volume (L/beat, C, ~70 ml). Efficiency (A) and index (B) are different, pressure (D) is unrelated.