ATI RN
Questions About the Cardiovascular System Questions
Question 1 of 5
Distribution of blood flow is mainly regulated by the:
Correct Answer: B
Rationale: Arterioles (B) regulate flow via resistance (smooth muscle). Arteries (A) conduct, capillaries (C) exchange, venules (D) collect.
Question 2 of 5
Which of the following would lead to a decreased heart rate?
Correct Answer: C
Rationale: High plasma potassium (C) (hyperkalemia) slows heart rate by depolarizing cells, reducing excitability. Norepinephrine (A), thyroid hormone (B), and calcium (D) increase rate.
Question 3 of 5
Cardiac output can be computed by:
Correct Answer: D
Rationale: Cardiac output = stroke volume × heart rate (D), e.g., 70 ml × 75 bpm = 5.25 L/min.
Question 4 of 5
The upper chambers of the heart
Correct Answer: B
Rationale: The atria (B) are the upper, receiving chambers. Ventricles (A) pump, auricles (C) extend atria, trabeculae (D) are in ventricles.
Question 5 of 5
The difference between systolic and diastolic blood pressure
Correct Answer: B
Rationale: Pulse pressure (B) is the difference between systolic and diastolic pressures (~40 mmHg). Mean arterial (A) is an average, others (C, D) are volume-related.