ATI RN
Cardiovascular System Questions and Answers Questions
Question 1 of 5
Blood pressure is usually expressed in units of millimetres of mercury (mmHg) as:
Correct Answer: B
Rationale: Blood pressure is expressed as systolic over diastolic (B, e.g., 120/80 mmHg), where systolic is peak pressure (ventricular contraction) and diastolic is resting pressure. C is pulse pressure, and D/E are not standard formats.
Question 2 of 5
What ECG wave accompanies ventricular depolarization?
Correct Answer: B
Rationale: The QRS complex (B) represents ventricular depolarization on an ECG. P wave (A) is atrial depolarization, T wave (C) is ventricular repolarization.
Question 3 of 5
Which of the following does NOT influence heart rate?
Correct Answer: D
Rationale: All listed factors influence heart rate (D): temperature (A) via metabolism, emotions (B) via autonomic input, and venous return (C) via preload and Bainbridge reflex.
Question 4 of 5
Identify the process that allows for the movement of carbon dioxide between the blood and the tissue fluid.
Correct Answer: B
Rationale: Carbon dioxide moves by diffusion (B) from high concentration (tissues) to low (blood) across capillaries. Active transport (A), filtration (C), and osmosis (D) don’t apply to gases.
Question 5 of 5
In response to a decrease in blood pressure, heart rate will ___ and the arterioles will ___
Correct Answer: D
Rationale: Low BP triggers sympathetic activation: heart rate increases and arterioles constrict (D) to raise BP. A, B, C would lower BP further.