The nurse who works on a cardiac unit is teaching the student nurse about heart sounds.The student nurse asks how the S1 heart sound is produced.Which of the following is the nurse's best response?
A) "It results from the closure of the semilunar valves."
B) "It is heard when the aortic valve closes just slightly faster than the pulmonic valve."
C) "It results from the closure of the atrioventricular valves."
D) "It is caused by atrial contraction and ejection of blood into the ventricles in late diastole."
Correct Answer:
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