ATI RN
Cardiovascular System Multiple Choice Questions Questions
Question 1 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 2 of 5
Second heart sound:
Correct Answer: C
Rationale: S₂ (C) has a longer, sharper sound (~0.08 s) than S₁ (~0.07 s) due to semilunar valve closure. A is S₁, B is true but not unique, D is secondary.
Question 3 of 5
Which of the following blood vessel is used to distribute oxygenated blood to the myocardium?
Correct Answer: A
Rationale: Coronary arteries (A) supply oxygenated blood to the myocardium. Coronary veins (B) and sinus (C) drain deoxygenated blood, pulmonary artery (D) carries deoxygenated blood to lungs.
Question 4 of 5
Cardiac output is the volume of blood ejected from the ventricle into the each minute.
Correct Answer: C
Rationale: Cardiac output (C) is total blood ejected per minute from both ventricles: left to aorta, right to pulmonary trunk (~5 L/min).
Question 5 of 5
Blood vessel that carries blood from the lungs to the heart
Correct Answer: B
Rationale: Pulmonary veins (B) carry oxygenated blood from the lungs to the left atrium. Pulmonary artery (A) is to lungs, aorta (C) is systemic, coronary sinus (D) drains heart.