The portion of the nervous system that has voluntary control over skeletal muscles is…

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Consider the division of the nervous system and what each component does.
Option 1: somatic motor. This is the system responsible for voluntary control of skeletal muscles, aligning with the question about voluntary control.
Option 2: sensory afferent. Afferent pathways carry sensory information from the body to the brain, not motor commands, so this does not address voluntary control of muscles.
Option 3: autonomic motor. The autonomic (or visceral) motor system governs involuntary actions like heartbeat and digestion; skeletal muscle control is not its domain, so this is incorrect for voluntary control of skeletal muscles.
Option 4: somatic sensory. This refers to sensory input from the body to the CNS, not motor output, so it cannot explain voluntary skeletal muscle control.
Option 5: sympathetic motor. Part of the autonomic nervous system, it modulates fight-or-flight responses and is not the pathway for voluntary skeletal muscle control.
In summary, only the somatic motor component directly mediates conscious, voluntary control of skeletal muscles, while the other options pertain to sensory information or involuntary motor systems.

BIOLOGY 211-B09C Practice Exam 2

The portion of the nervous system that has voluntary control over skeletal muscles is…

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