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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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lbelcher lbelcher
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5 years ago

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

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

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


Edition: 2nd
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peaceout3000peaceout3000
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lbelcher Author
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5 years ago
You make an excellent tutor!
sudenzia
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This calls for a celebration Person Raising Both Hands in Celebration
Lourd Jenkins
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Smart ... Thanks!
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