ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
Which of the following opposes the action of thromboxane A2 by inhibiting platelet adhesion and release?
Correct Answer: B
Rationale: Prostacyclin (B) from endothelium inhibits platelet aggregation, opposing thromboxane A2. Heparin (A) is an anticoagulant, fibrinogen (C) forms clots, thrombin (D) activates clotting.
Question 2 of 5
Heme is broken down into this substance, which is excreted in bile.
Correct Answer: C
Rationale: Heme degrades to bilirubin (C), excreted in bile.
Question 3 of 5
A person with only antibody B in his or her plasma would have which blood type?
Correct Answer: A
Rationale: Type A (A) has anti-B antibodies, no B antigen.
Question 4 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 5 of 5
Substance that combines with calcium to convert fibrinogen to fibrin
Correct Answer: B
Rationale: Thrombin (B) with calcium converts fibrinogen to fibrin.