ATI RN
Cardiovascular System Questions and Answers Questions
Question 1 of 5
CCU stands for:
Correct Answer: B
Rationale: CCU typically means coronary care unit (B), specialized for heart conditions like MI. A and D are similar but less specific, C is unrelated.
Question 2 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 3 of 5
The dicrotic notch on the aortic pressure curve is caused by:
Correct Answer: C
Rationale: The dicrotic notch (C) reflects aortic valve closure, causing a brief pressure dip. Pulmonary valve (A) is pulmonary, filling (B) is diastolic, contraction (D) is systolic.
Question 4 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 5 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.