As you are driving, sensory neurons located in your eye send impulses to your brain. Concurrently, motor neurons stimulate the movement of your hands, eyes, and legs allowing you to push the gas pedal, stay within your driving lane and see what turns are approaching. Which division of the nervous system allows you to conduct these behaviors?未知题型
A
The autonomic nervous system.
B
The somatic nervous system.
C
The sympathetic nervous system.
D
The parasympathetic nervous system

Question

As you are driving, sensory neurons located in your eye send impulses to your brain. Concurrently, motor neurons stimulate the movement of your hands, eyes, and legs allowing you to push the gas pedal, stay within your driving lane and see what turns are approaching. Which division of the nervous system allows you to conduct these behaviors?未知题型

A

The autonomic nervous system.

B

The somatic nervous system.

C

The sympathetic nervous system.

D

The parasympathetic nervous system

BlackTom AI · Accepted Answer

Voluntary control of skeletal muscles is mediated by the somatic nervous system. Sensory input from the eyes travels as afferent (sensory) signals to the central nervous system, and efferent (motor) signals from the somatic division drive skeletal muscles in your hands, legs, and the extraocular muscles that move your eyes.

1) Relevant concepts:
- Peripheral nervous system (PNS) splits into somatic and autonomic divisions.
- Somatic nervous system: carries sensory information from external receptors to the CNS and sends motor commands to skeletal (voluntary) muscles via somatic motor neurons and neuromuscular junctions (acetylcholine-mediated).
- Autonomic nervous system: controls involuntary effectors (smooth muscle, cardiac muscle, glands) and divides into sympathetic (fight-or-flight) and parasympathetic (rest-and-digest) branches.

2) Step-by-step reasoning:
- Sensory neurons in the eye are afferent neurons that convey visual information to the brain (part of the PNS sensory pathway).
- The brain processes that visual information and generates motor commands when you decide to steer, press the gas, or shift lanes.
- Those motor commands travel as somatic efferent signals to skeletal muscles of hands, legs, and eye muscles to produce coordinated, voluntary movements.
- Because these actions are consciously controlled and involve skeletal muscles, they fall under the somatic nervous system.

3) Intermediate physiological detail:
- Somatic motor neurons synapse directly with skeletal muscle fibers at neuromuscular junctions, causing contraction; this direct, voluntary pathway contrasts with autonomic pathways that use pre- and postganglionic neurons and target smooth/cardiac muscle or glands.

4) Why the correct answer is correct:
- The scenario describes conscious, voluntary behaviors and sensory perception driving skeletal muscle activity—hallmarks of the somatic nervous system.

5) Why other options are incorrect:
- Autonomic nervous system: controls involuntary functions (e.g., heart rate, digestion), not voluntary steering and pedaling.
- Sympathetic nervous system: a branch of the autonomic system specialized for fight-or-flight responses; not the primary controller of deliberate limb and eye movements.
- Parasympathetic nervous system: another autonomic branch for rest-and-digest functions; also not responsible for voluntary motor control.

Conclusion: The correct choice is The somatic nervous system. This matches the provided answer.

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