ATI RN
Cardiovascular System Multiple Choice Questions Questions
Question 1 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 2 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 3 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.
Question 4 of 5
Which of the following most accurately describes the order of the cardiac conduction system?
Correct Answer: C
Rationale: The correct order is SA node (initiates), AV node (delays), bundle of His, Purkinje fibers (C), ensuring atrial then ventricular contraction.
Question 5 of 5
What percentage of blood plasma is water?
Correct Answer: B
Rationale: Plasma is ~91.5% water (B), with the rest being proteins, electrolytes, etc. Other options are incorrect per standard physiology.