ATI RN
Cardiovascular System Questions and Answers Questions
Question 1 of 5
Which blood constituent adheres to any rough surface?
Correct Answer: D
Rationale: Platelets adhere to rough surfaces (e.g., damaged endothelium) to form a plug, initiating hemostasis. Thromboplastin is a protein, fibrinogen forms fibrin, and leukocytes don’t primarily adhere.
Question 2 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 3 of 5
Identify the heart valve that is also called the mitral valve.
Correct Answer: B
Rationale: The bicuspid valve (B), between the left atrium and ventricle, is also called the mitral valve. Aortic (A) and pulmonary (C) are semilunar valves, and tricuspid (D) is on the right side.
Question 4 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 5 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.