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colleen colleen
wrote...
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Posts: 17077
10 years ago
Which of the following events result in the first heart sound?
A) The AV valves open.
B) The AV valves close.
C) The semilunar valves close.
D) The semilunar valves open.
E) The atria contract.
Textbook 
Human Physiology: An Integrated Approach

Human Physiology: An Integrated Approach


Edition: 8th
Author:
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nite_n_daynite_n_day
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Posts: 4086
10 years ago
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colleen Author
wrote...
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10 years ago
Wonderful Smiling Face with Open Mouth Smiling Face with Open Mouth
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