Neurotransmitter secreted at the synapse outside the central nervous system is:

Explanation

Acetylcholine is a neurotransmitter that is secreted at synapses outside the central nervous system. It plays a crucial role in transmitting signals between neurons and between neurons and muscles in various parts of the body. Acetylcholine (ACh) is an important neurotransmitter that carries messages between nerve cells, affecting muscle contraction, memory, learning, arousal, and various autonomic functions like heart rate and blood pressure. It acts at neuromuscular junctions, in the central nervous system, and throughout the autonomic nervous system, being released by neurons and then broken down by an enzyme to allow for rapid signaling. Conditions like Alzheimer's disease and myasthenia gravis are associated with low acetylcholine levels.