ATI RN
Cardiovascular System Practice Questions Questions
Question 1 of 5
If you stand up too quickly and blood pressure drops, baroreceptors in the carotid arteries will signal the cardioregulatory center to send
Correct Answer: D
Rationale: Baroreceptors detect low BP and signal the medulla to send sympathetic signals (D) to increase heart rate and vasoconstriction, restoring BP. Parasympathetic (A, B) slows HR, C opposes the response.
Question 2 of 5
The vasomotor center that controls the diameter of blood vessels is located in the
Correct Answer: A
Rationale: The vasomotor center in the medulla oblongata (A) regulates vessel diameter via sympathetic signals. Pons (B), cerebrum (C), and cerebellum (D) have other roles.
Question 3 of 5
The end of the descending aorta branches into the:
Correct Answer: B
Rationale: The descending aorta (abdominal) ends by branching into the common iliac arteries (B) supplying the pelvis and legs. Celiac (A), renal (C), and mesenteric (D) branch earlier.
Question 4 of 5
Thickest layer in heart is:
Correct Answer: D
Rationale: The myocardium (D) is the thickest layer, comprising the heart’s muscular wall (~2-15 mm depending on chamber). Epicardium (A) is a thin serous layer, endocardium (B) is endothelium, and pericardium (C) is the outer sac.
Question 5 of 5
Bradycardia occurs in:
Correct Answer: B
Rationale: Bradycardia (<60 bpm) is common in athletes (B) due to high vagal tone and cardiovascular fitness. Pilots (A), surgeons (C), and chess players (D) don’t typically exhibit it.