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The somatic nervous system controls voluntary muscle movement and consists of efferent nerves that stimulate skeletal muscle contraction. Nerve signals travel from the motor cortex to motor neurons in the spinal cord which activate alpha motor neurons, causing them to release acetylcholine and contract muscles. In vertebrates, muscle contraction is always excitatory while invertebrates can have excitatory or inhibitory responses. Reflex arcs provide automatic links between sensory input and motor output thr
- Author
- Jaeshin
- Language
- EN