How does the nervous system control an animal’s muscles and hormone activity?

The nervous system controls muscular activity and hormone production through specialized signaling mechanisms that rely on both electrical impulses and chemical messengers.12

Muscular Control

Muscles are controlled by motor neurons that transmit electrical signals from the central nervous system. When an impulse reaches the neuromuscular junction, the electrical signal is converted into a chemical one. The nerve releases neurotransmitters—such as acetylcholine—which diffuse across the synapse to bind with receptors on the muscle membrane, triggering contraction. While some muscles, such as cardiac and smooth muscle, can utilize gap junctions to propagate impulses independently, most coordinated movement requires the precise, patterned signals provided by the nervous system.234

Hormone Activity

The nervous system regulates hormone production primarily through the hypothalamic-pituitary-target gland axis. Specialized neurosecretory cells in the hypothalamus translate neural signals into neurohormones. These are released into the bloodstream to stimulate or inhibit the pituitary gland, which in turn controls other endocrine glands. This integration allows the body to adjust hormone levels in response to external environmental stresses or internal emotional states detected by the brain.516