PSI Barbering Practice Exam

Which nerve fibers carry impulse from the brain to control muscle movement?

1. Sensory

2. Motor

3. Autonomic

4. Sympathetic

The correct answer is: Motor

Motor nerve fibers are responsible for carrying impulses from the brain to the muscles, facilitating voluntary movement. These fibers convey signals that lead to muscle contraction, allowing us to perform actions such as walking, writing, or any other physical activity that requires muscle engagement. Sensory nerve fibers, in contrast, transmit information from sensory receptors to the brain, allowing us to perceive stimuli such as touch, pain, and temperature. Autonomic nerve fibers control involuntary functions, such as heart rate and digestion, rather than conscious muscle movement. Sympathetic fibers are part of the autonomic nervous system specifically involved in the fight-or-flight response, also not directly associated with voluntary muscle control. Therefore, motor fibers play a crucial role in our ability to initiate and control muscle movements.