Messages are transmitted from your spinal cord to your heart muscles by the

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The autonomic nervous system is responsible for transmitting messages from the spinal cord to the muscles of the heart, as well as other smooth muscles and glands throughout the body. The endocrine system and somatic nervous system are not directly involved in this process, and while the central nervous system (which includes the spinal cord) plays a role in coordinating and controlling bodily functions, it does not transmit messages directly to specific muscles or organs.

Messages Are Transmitted from Your Spinal Cord to Your Heart