ATI RN
Cardiovascular System Questions Questions
Question 1 of 5
Which are the most numerous white blood cells?
Correct Answer: B
Rationale: Neutrophils (B) are 60-70% of WBCs.
Question 2 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.
Question 3 of 5
Which chamber initially receives blood from the systemic circuit?
Correct Answer: C
Rationale: The right atrium (C) receives deoxygenated blood from the systemic circuit via the vena cava.
Question 4 of 5
In a healthy young adult, what happens to cardiac output when heart rate increases above 160 bpm?
Correct Answer: B
Rationale: Above ~160 bpm, diastolic filling time shortens, reducing stroke volume and cardiac output (B).
Question 5 of 5
The nurse should administer amiodarone (Cordarone) to treat which of the following arrhythmias?
Correct Answer: C
Rationale: Amiodarone (C) treats life-threatening ventricular tachycardia by prolonging the action potential. Others (A, B, D) involve slower rates, not its primary use.