The parasympathetic system, which controls heart rate through the _____ nerve, interacts only with the _____ and so cannot alter contractility.

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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 parasympathetic system, which controls heart rate through the _____ nerve, interacts only with the _____ and so cannot alter contractility.