ATI RN
Cardiovascular System Questions Questions
Question 1 of 5
A hematocrit value of 42% would be:
Correct Answer: B
Rationale: 42% (B) is average for women (~38-46%); men average ~45% (40-50%).
Question 2 of 5
Substance that hydrolyzes fibrin strands and dissolves blood clots
Correct Answer: C
Rationale: Plasmin (C) degrades fibrin, dissolving clots.
Question 3 of 5
Which are the most numerous white blood cells?
Correct Answer: B
Rationale: Neutrophils (B) are 60-70% of WBCs.
Question 4 of 5
Which of the following statements is false?
Correct Answer: C
Rationale: Platelets (C) are fragments, not whole cells; others are true.
Question 5 of 5
Clusters of neurons in the medulla oblongata that regulate blood pressure are known collectively as
Correct Answer: D
Rationale: The cardiovascular center (D) in the medulla regulates BP via autonomic signals. Baroreceptors (A) are sensors, not neurons; B and C are incorrect terms.