In response to a student nurse's question, the nurse correctly states:
1. "The first heart sound reflects the sound produced by relaxation of the atria."
2. "The first heart sound reflects the closing of the mitral and tricuspid valves."
3. "The first heart sound reflects the closing of the pulmonary and aortic valves."
4. "The first heart sound reflects the beginning of the atrial contraction."
ANS: 2
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Fill in the blank(s) with correct word
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