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lbelcher lbelcher
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Posts: 482
4 years ago

________ are donut-shaped muscles that act as doorways to let materials in and out by alternately contracting and relaxing.

Textbook 
Anatomy, Physiology, & Disease: An Interactive Journey for Health Professions

Anatomy, Physiology, & Disease: An Interactive Journey for Health Professions


Edition: 2nd
Authors:
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peaceout3000peaceout3000
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Posts: 380
4 years ago
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lbelcher Author
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4 years ago
You make an excellent tutor!
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Yesterday
Thanks
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2 hours ago
Good timing, thanks!
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