The nerves that control voluntary responses like those connected to your muscles are part of the nervous system.
a. somatic
b. autonomic
c. sympathetic
d. parasympathetic

The correct answer would be A. somatic nervous system.

A somatic nervous system is sub-set of the peripheral nervous system which controls the voluntary actions and body movements with the help of skeletal muscles.

This system mainly consists of two types of nerves:

Afferent nerves: Theses are sensory nerves which carry stimulus or information from receptors to the central nervous system (brain and spinal cord).

Efferent nerves: These are also termed as motor nerves which carry commands or responsive information from the central nervous system to the muscles.

The muscles contract and produce movements.

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