ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
After Martha's baby was born, why did the physician apply a gauze dressing for a short time on the umbilical cord and give the baby a dose of vitamin K?
Correct Answer: D
Rationale: Vitamin K (D) aids liver production of clotting factors, often low in newborns; gauze aids hemostasis.
Question 2 of 5
The substance that stimulates formation of platelets is:
Correct Answer: A
Rationale: Thrombopoietin (A) drives platelet production.
Question 3 of 5
An ABO mismatched blood transfusion can cause acute renal failure because the
Correct Answer: D
Rationale: Mismatched transfusion lyses RBCs, releasing hemoglobin that clogs kidneys (D).
Question 4 of 5
Venoconstriction increases which of the following?
Correct Answer: D
Rationale: Venoconstriction narrows veins, increasing pressure (A), flow (B), and venous return to the heart (C), thus all (D), aiding circulation.
Question 5 of 5
Which of the following is not important in preventing backflow of blood?
Correct Answer: D
Rationale: Chordae tendineae (A), papillary muscles (B), and AV valves (C) prevent backflow in ventricles. Endocardium (D) lines the heart but doesn’t prevent backflow.