The anal canal is a 1.5 cm passageway which conducts feces out of the rectum. It includes two _____; the inner one is involuntary, the outer, voluntary.

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.


1. The anal canal is a 1.5 cm passageway which conducts feces out of the rectum. It includes two _____; the inner one is involuntary, the outer, voluntary.