ATI RN
Cardiovascular System Test Questions Questions
Question 1 of 5
Receptors that are sensitive to changes in pressure
Correct Answer: B
Rationale: Baroreceptors (B) detect pressure changes in blood vessels, regulating heart rate and pressure. Chemoreceptors (A) sense chemicals, others (C, D) are unrelated.
Question 2 of 5
Which of the following substances is an anticoagulant produced by mast cells and basophils?
Correct Answer: A
Rationale: Heparin (A) from mast cells/basophils inhibits clotting. Fibrinogen (B) forms clots, thromboxane A2 (C) promotes aggregation, prostacyclin (D) inhibits platelets.
Question 3 of 5
Which of the following formed elements in blood are removed by fixed macrophages in the spleen and liver after only 5 to 9 days in the circulation?
Correct Answer: B
Rationale: Thrombocytes (platelets, B) last 5-9 days, cleared by spleen/liver macrophages.
Question 4 of 5
Which of the following cell types are classified as agranulocytes?
Correct Answer: D
Rationale: Agranulocytes (D) lack granules: lymphocytes and monocytes.
Question 5 of 5
Which of the following does not hasten clotting?
Correct Answer: B
Rationale: Heparin (B) inhibits clotting; others (A, C, D) promote it.