ATI RN
Cardiovascular System Multiple Choice Questions Questions
Question 1 of 5
The fluid that surrounds the cells of the body is called:
Correct Answer: D
Rationale: Tissue fluid (D), or interstitial fluid, surrounds cells, derived from plasma (C) leaking from capillaries. Blood (A) is in vessels, lymph (B) is in lymphatic vessels.
Question 2 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 3 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 4 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.
Question 5 of 5
The ventricular repolarisation in ECG is best seen in:
Correct Answer: D
Rationale: The T wave (D) represents ventricular repolarization. P wave (A) is atrial depolarization, QRS (B) is ventricular depolarization, and U wave (C) is minor/uncertain.