Approximately the first _____ days of the uterine cycle constitute the _____ phase, during which the surface of the endometrium is shed and discarded via the vagina.

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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. Approximately the first _____ days of the uterine cycle constitute the _____ phase, during which the surface of the endometrium is shed and discarded via the vagina.