ATI RN
Questions About the Cardiovascular System Questions
Question 1 of 5
A hematocrit of 56% would be an indication of:
Correct Answer: D
Rationale: Hematocrit 56% (D) exceeds normal (~45%), indicating polycythemia (excess RBCs).
Question 2 of 5
Which characteristic of blood makes it especially effective in temperature regulation?
Correct Answer: B
Rationale: Blood’s high specific heat (B) absorbs/distributes heat effectively.
Question 3 of 5
Small, colorless bodies that function in blood clotting and hemostasis
Correct Answer: B
Rationale: Platelets (B) initiate clotting and hemostasis.
Question 4 of 5
Protein that is made by the liver and acted on to become thrombin
Correct Answer: D
Rationale: Prothrombin (D) is liver-made, converted to thrombin.
Question 5 of 5
Which of the following is not involved in platelet plug formation?
Correct Answer: D
Rationale: ADH (D) regulates water, not platelet binding; others (A, B, C) aid plug formation.