O Levels Biology (5090)•5090/12/M/J/24

Explanation
Sensory Neurons Transmit from Receptors to CNS
Steps:
- Identify sensory neurons as those carrying signals from sensory receptors.
- Recall that the central nervous system (CNS) includes the spinal cord and brain.
- Match function to pathway: impulses start at receptors and go to CNS for processing.
- Eliminate options not matching this afferent (incoming) direction.
Why B is correct:
- Sensory neurons conduct impulses from receptors (e.g., skin, eyes) to the spinal cord, part of the CNS, per basic neurophysiology.
Why the others are wrong:
- A: Muscles send feedback via other sensory fibers, not primary sensory neuron role.
- C: Receptors to muscles bypasses CNS; this is not a direct neural pathway.
- D: Spinal cord to muscles describes motor (efferent) neurons.
Final answer: B
Topic: Mammalian nervous system
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