ATI RN
Cardiovascular System Questions and Answers Questions
Question 1 of 5
Cardiac output in L/min divided by heart rate equals:
Correct Answer: C
Rationale: Cardiac output (L/min) ÷ heart rate (bpm) = stroke volume (L/beat, C, ~70 ml). Efficiency (A) and index (B) are different, pressure (D) is unrelated.
Question 2 of 5
Which of the following type of muscle contains the largest number of mitochondria per cell?
Correct Answer: C
Rationale: Cardiac muscle (C) has the most mitochondria per cell due to its constant energy demand. Smooth (A) has fewer, skeletal (B) varies, and D is incorrect.
Question 3 of 5
Isovolumetric contraction is the phase of the cardiac cycle in which
Correct Answer: D
Rationale: Isovolumetric contraction is when ventricular pressure rises but volume stays constant, as all valves are closed.
Question 4 of 5
Valve through which the right ventricle pumps blood
Correct Answer: B
Rationale: The right ventricle pumps blood through the pulmonary semilunar valve (B) into the pulmonary artery. Tricuspid (A) is inflow, aortic (C) and mitral (D) are left-sided.
Question 5 of 5
The hormone that increases water reabsorbed by the kidney
Correct Answer: B
Rationale: ADH (B) increases water reabsorption in the kidneys, raising blood volume. Aldosterone (A) affects sodium, ANP (C) reduces volume, epinephrine (D) is stress-related.