What are the terminal ends of autonomic nervous system nerves in the heart called?

What are the terminal ends of autonomic nervous system nerves in the heart called?

• A. Synapses
• B. Soma
• C. Botons
• D. Boutons

Answer: (D)

The terminal ends of autonomic nervous system nerves in the heart are referred to as boutons. These specialized structures release neurotransmitters that influence the function of the heart muscle and regulate heart rate and contractility. The term 'boutons' specifically describes these small bulbous structures at the endings of nerve fibers, which form synaptic connections with cardiomyocytes (heart muscle cells) or other neurons in the autonomic pathways.

Understanding the role of boutons is crucial, as they are integral in transmitting signals from the nervous system to the heart, thereby playing a significant role in physiological responses such as stress or relaxation. This interaction is vital for maintaining cardiovascular health and responding appropriately to various physiological demands.