Messages are transmitted from your spinal cord to your heart muscles by the a) motor nervous system b) somatic nervous system c) central nervous system d) autonomic nervous system e) parasympathetic nervous system

Messages are transmitted from your spinal cord to your heart muscles by the  D) autonomic nervous system.

This is a part of the nervous system that "supplies the internal organs, including the blood vessels, stomach, intestine, liver, kidneys, bladder, genitals, lungs, pupils, heart, and sweat, salivary, and digestive glands"

Sodium is the answer

Is this used on a test? ?