ATI RN
Cardiovascular System Assessment Questions Questions
Question 1 of 5
What is the natural pacemaker of the heart?
Correct Answer: B
Rationale: The SA node (B) is the natural pacemaker, initiating impulses at 60-100 bpm. The AV node (C) delays, AV bundle (A) conducts, and Purkinje fibers (D) spread the signal.
Question 2 of 5
Which of the following is NOT an aspect of capillary structure and function?
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.
Question 3 of 5
Venous return does NOT depend on
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.
Question 4 of 5
List the sections of the aorta beginning with the section that leaves the heart.
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.
Question 5 of 5
With age, the size of the heart typically ___ and the resting heart rate ___
Correct Answer: D
Rationale: With age, the heart size increases (D) due to hypertrophy from workload, and resting heart rate decreases due to reduced autonomic responsiveness and fitness.