ATI RN
Questions About the Cardiovascular System Questions
Question 1 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 2 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 3 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.
Question 4 of 5
Which of the following blood cells is a phagocyte?
Correct Answer: A
Rationale: Neutrophils (A) are phagocytic WBCs, engulfing pathogens. Platelets (B) clot, lymphocytes (C) are immune, erythrocytes (D) transport gases.
Question 5 of 5
Which of the following precursor cells eventually give rise to neutrophils?
Correct Answer: D
Rationale: Myeloblasts (D) form granulocytes like neutrophils. Megakaryoblasts (A) form platelets, proerythroblasts (B) RBCs, T lymphoblasts (C) lymphocytes.