Colorado Esthetician Written Practice Exam

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What function do motor nerves (efferent nerves) serve?

  1. Carry impulses from the brain to the muscles or glands and produce movement

  2. Carry impulses or messages to the brain from the sense organs

  3. Enable involuntary muscle control

  4. Regulate immune response

The correct answer is: Carry impulses from the brain to the muscles or glands and produce movement

Motor nerves, also known as efferent nerves, are responsible for carrying impulses from the brain to muscles or glands in order to produce movement. These nerves do not carry messages to the brain from sense organs (B), regulate immune response (D), or enable involuntary muscle control (C). This is why option A, carrying impulses to produce movement, is the correct function of motor nerves.

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