ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
Approximately what percentage of carbon dioxide is found in expired air?
Correct Answer: C
Rationale: Expired air contains about 4-5% carbon dioxide, significantly higher than the 0.04% in atmospheric air, due to CO₂ exhalation from metabolism. 20% and 40% are too high, reflecting oxygen or total gas misconceptions.
Question 2 of 5
After receiving a permanent pacemaker, the client asks the nurse if there are any activities to avoid during a vacation scheduled for 4 months after discharge. Which of the following is the most appropriate response by the nurse?
Correct Answer: B
Rationale: Four months post-pacemaker, most activities are safe, but strong electromagnetic fields (e.g., running engines) can interfere with pacemaker function. Microwaves and swimming are generally safe once healed.
Question 3 of 5
Excessive alcohol use while on warfarin sodium (Coumadin) therapy leads to:
Correct Answer: C
Rationale: Excessive alcohol increases warfarin's anticoagulation effect by impairing liver metabolism, raising bleeding risk. INR increases (not decreases, B), and vitamin K absorption (D) is unaffected; A is the opposite effect.
Question 4 of 5
The heart is located in the:
Correct Answer: A
Rationale: The heart is situated in the thoracic cavity, specifically within the mediastinum, between the lungs. The abdominal cavity (Choice B) contains organs like the stomach and liver, the pelvic cavity (Choice C) houses reproductive and urinary organs, and the cranial cavity (Choice D) contains the brain. Only the thoracic cavity correctly identifies the heart’s location.
Question 5 of 5
The process of blood clot formation is known as:
Correct Answer: C
Rationale: Coagulation (Choice C) specifically refers to the process of blood clot formation, where blood transforms from a liquid to a gel-like state through a cascade of clotting factors. Hemostasis (Choice A) is the broader process of stopping bleeding, which includes coagulation but also vessel constriction. Thrombolysis (Choice B) is clot dissolution, and fibrinolysis (Choice D) is the breakdown of fibrin in clots—both opposites of formation. Choice C is the precise term.