ATI RN
Cardiovascular System Quiz Questions Questions
Question 1 of 5
Heart chamber that receives blood that has just passed through the right atrioventricular valve
Correct Answer: B
Rationale: The right ventricle (B) receives blood from the right atrium via the tricuspid valve (right AV). Atria (A, C) send blood, left ventricle (D) is systemic.
Question 2 of 5
A megakaryoblast will develop into
Correct Answer: C
Rationale: Megakaryoblasts form platelets (C) via fragmentation in bone marrow. RBCs (A), WBCs (B), and lymphocytes (D) arise from different precursors.
Question 3 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 4 of 5
The average life span of an erythrocyte in the circulation is
Correct Answer: D
Rationale: Erythrocytes (D) live ~120 days, removed by spleen/liver.
Question 5 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.