ATI RN
100 Questions on the Cardiovascular System PDF Questions
Question 1 of 5
Arteries are:
Correct Answer: B
Rationale: Arteries (B) have thick, elastic walls to handle high pressure (~100 mmHg). Veins are thin-walled with low pressure (A, D incorrect), and C contradicts arterial structure.
Question 2 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 3 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 4 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.
Question 5 of 5
Which of the following factors increases heart rate?
Correct Answer: C
Rationale: Anxiety and fear (C) increase heart rate via sympathetic activation. Pain (A) and cold (B) may slow it via vagal reflexes, grief (D) varies.