The first heart sound ("lubb") is produced as the atrioventricular valves ________ and the semilunar valves ________.
A) open; close
B) close; open
C) open; open
D) close; close
E) The actions of the valves do not contribute to the heart sounds.
Correct Answer:
Verified
Q87: Which of the following is greatest during
Q88: Relaxation of the heart chambers is called
A)
Q89: Identify the correct match.
A) Systole = relaxation
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A) cardiac muscle cells
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Q96: The second heart sound is heard when
A)
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