ATI RN
Cardiovascular System Multiple Choice Questions Questions
Question 1 of 5
The cardiac control center (cardioregulatory center) is located in the
Correct Answer: C
Rationale: The cardioregulatory center in the medulla oblongata (C) controls heart rate via autonomic signals. The atrium (A) has the SA node, hypothalamus (B) regulates other functions, and carotid artery (D) has baroreceptors.
Question 2 of 5
The respiratory pump ___ the pressure difference between the abdominal region and the thoracic region thus leading to a(n) ___ in venous return.
Correct Answer: D
Rationale: The respiratory pump increases the thoracoabdominal pressure gradient (D) during inspiration (low thoracic pressure), enhancing venous return to the heart.
Question 3 of 5
Identify the vessels that branch off the aortic arch.
Correct Answer: A
Rationale: The aortic arch branches into the brachiocephalic, left common carotid, and left subclavian arteries (A). B is descending aorta, C are veins, D is ascending aorta.
Question 4 of 5
Normally cardiac cycle takes complete:
Correct Answer: D
Rationale: At a normal heart rate of 75 bpm, the cardiac cycle lasts ~0.8 seconds (D, 60/75 = 0.8 s). A, B, and C are too short for a full cycle.
Question 5 of 5
About percent of the total cardiac output goes to the kidney:
Correct Answer: C
Rationale: The kidneys receive ~25% (C) of cardiac output (~1.2 L/min of 5 L/min) for filtration. A, B are too low, D too high.