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The parasympathetic nervous system influences heart rate by releasing the neurotransmitter _____ which causes _____ to open. This leads to _____ of the cells in the SA and AV nodes.

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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 nervous system influences heart rate by releasing the neurotransmitter _____ which causes _____ to open. This leads to _____ of the cells in the SA and AV nodes.





 
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