ATI RN
100 Questions on the Cardiovascular System PDF Questions
Question 1 of 5
Diaphragm is supplied by arteries:
Correct Answer: B
Rationale: The diaphragm is supplied by phrenic arteries (B) from the aorta. Coronary (A) supplies the heart, renal (C) the kidneys, and vasa vasorum (D) vessel walls.
Question 2 of 5
Increased functional demand on the heart produces increased size of the myocardium by:
Correct Answer: B
Rationale: Chronic demand (e.g., hypertension) causes myocardial hypertrophy (B), increasing cell size. Hyperplasia (A) is rare in adult heart, C and D are pathological.
Question 3 of 5
SA node acts as a pacemaker of the heart because of the fact that it:
Correct Answer: D
Rationale: The SA node (D) fires fastest (~60-100 bpm), outpacing others. A is true but general, B and C are partial (it has both innervations).
Question 4 of 5
Identify the muscular ridges that are found on the anterior wall of the right atrium and extend into the auricles.
Correct Answer: A
Rationale: Pectinate muscles (A) are ridges in the right atrium and auricles. Trabeculae carneae (B) are in ventricles, coronary sulci (C) are grooves, and papillary muscles (D) anchor valves.
Question 5 of 5
Stimulation of which nerve reduces heart rate?
Correct Answer: D
Rationale: The vagus nerve (D) (parasympathetic) slows heart rate via acetylcholine. Cardiac accelerator (A) (sympathetic) increases it, hypoglossal (B) and spinal accessory (C) are unrelated.