ATI RN
Cardiovascular System Practice Questions Questions
Question 1 of 5
Calcium ions are necessary for the formation of:
Correct Answer: C
Rationale: Calcium ions are essential in the clotting cascade, particularly for converting prothrombin to thrombin (via factor Xa). They also aid other steps but are not directly needed to form fibrinogen, thromboplastin, or prothrombin.
Question 2 of 5
Which factor is not synthesized in hemophilia A?
Correct Answer: A
Rationale: Hemophilia A is a deficiency in factor VIII (antihemophilic factor), impairing the intrinsic pathway. Factor IX deficiency is hemophilia B, and VII and XII are unrelated to hemophilia A.
Question 3 of 5
A client recently had a pacemaker implanted and the nurse assistant notifies the nurse that the client called out complaining of dizziness. Which of the following is the first step that the nurse should take?
Correct Answer: D
Rationale: The nurse’s first step is to assess the client (D) by checking heart sounds and pulses, as dizziness may indicate pacemaker malfunction or hemodynamic instability. Assessment precedes diagnostic tests like EKG (B) or interrogation (A), and calling the provider (C) comes after initial data collection. (Source: Document, p. 4-5)
Question 4 of 5
Within the circulation, where is blood pressure highest?
Correct Answer: B
Rationale: Blood pressure is highest in the left ventricle (B) during systole (~120 mmHg), as it pumps into the aorta. The right ventricle (C) peaks at ~25 mmHg, pulmonary artery (D) is lower, vena cava (A) is near 0 mmHg, and left atrium (E) is ~8-12 mmHg.
Question 5 of 5
Identify the valve that prevents blood from flowing back into the right ventricle.
Correct Answer: B
Rationale: The pulmonary semilunar valve (B) prevents backflow from the pulmonary artery into the right ventricle during diastole. The aortic valve (A) protects the left ventricle, tricuspid (C) the right atrium, and bicuspid (D) the left atrium.