Cardiac muscle fibers are arranged end to end to pull against each other, but the chains formed by these fibers ultimately pull against the _____ of the heart.

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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. Cardiac muscle fibers are arranged end to end to pull against each other, but the chains formed by these fibers ultimately pull against the _____ of the heart.