ATI RN
Cardiovascular System Questions and Answers Questions
Question 1 of 5
Blood supply to heart vessels is by:
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.
Question 2 of 5
Cardiac output is a measure of:
Correct Answer: D
Rationale: Cardiac output = heart rate × stroke volume (D, ~5 L/min). A, B, and C are incorrect combinations.
Question 3 of 5
Cardiac output in L/min divided by heart rate equals:
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.
Question 4 of 5
The dicrotic notch on the aortic pressure curve is caused by:
Correct Answer: C
Rationale: The dicrotic notch (C) reflects aortic valve closure, causing a brief pressure dip. Pulmonary valve (A) is pulmonary, filling (B) is diastolic, contraction (D) is systolic.
Question 5 of 5
Which of the following type of muscle contains the largest number of mitochondria per cell?
Correct Answer: C
Rationale: Cardiac muscle (C) has the most mitochondria per cell due to its constant energy demand. Smooth (A) has fewer, skeletal (B) varies, and D is incorrect.