The electrical impulse from the SA node to the _____ is rapid, but then it is slowed dramatically because the fibers there have fewer _____. This allows time for the _____ to contract before the _____.

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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 electrical impulse from the SA node to the _____ is rapid, but then it is slowed dramatically because the fibers there have fewer _____. This allows time for the _____ to contract before the _____.