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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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vadim44 vadim44
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6 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.
Textbook 
Human Anatomy

Human Anatomy


Edition: 9th
Authors:
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miri13miri13
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6 years ago
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vadim44 Author
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6 years ago
This calls for a celebration Person Raising Both Hands in Celebration
kriggs62
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Yesterday
Smart ... Thanks!
derya1234
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2 hours ago
You make an excellent tutor!
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