NCLEX RN Client Needs Physiologic Adaptation Related

Review NCLEX RN Client Needs Physiologic Adaptation related questions and content

A student nurse is precepting on the cardiac unit with the charge nurse. The charge nurse is educating the student about heart sounds and asks the student nurse to describe what causes the S1 sound. Which response by the student nurse reflects an understanding of cardiac sounds?

  • A. It is caused by the mitral and tricuspid valves closing.
  • B. It is caused by the mitral and pulmonic valves closing.
  • C. It is caused by the pulmonic and aortic valves closing.
  • D. It is caused by the aortic and tricuspid valves closing.
Correct Answer: A

Rationale: S1 is caused by the closure of mitral and tricuspid valves (A) at the start of systole. Pulmonic and aortic valves (C) cause S2, and other combinations (B, D) are incorrect.