ATI RN
Cardiovascular System Multiple Choice Questions Questions
Question 1 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 2 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 3 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 4 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.
Question 5 of 5
Under resting condition, the cardiac output is:
Correct Answer: C
Rationale: Resting cardiac output is ~5.25 L/min (C, 70 ml × 75 bpm). A and B are too low, D too high for rest.