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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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barry barry
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Posts: 11630
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10 years ago
Valves of the heart open and close due to
A) contraction of papillary muscles.
B) timing sequences.
C) electrical signals.
D) pressure changes.
E) None of the answers are correct.
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baliwboybaliwboy
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10 years ago
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barry Author
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10 years ago
Thanks
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