In contrast to motor and relay neurons, the sensory neurons contain
Correct answer: B. single dendron.
- A. single axon.
- B. single dendron.
- C. multiple dendrites.
- D. multiple nodes of Ranvier.
Explanation
The correct answer is Option B: single dendron. Sensory neurons are distinct because they have a single dendron that conducts impulses from sensory receptors towards the cell body. In contrast, motor and relay neurons have multiple dendrites for receiving signals from other neurons. Option A is incorrect because having a single axon is common to all neurons, including motor and relay neurons, and does not distinguish sensory neurons. Option C is incorrect because multiple dendrites are characteristic of motor and relay neurons, not sensory neurons. Option D is incorrect because the presence of multiple nodes of Ranvier occurs in all myelinated neurons, not just sensory neurons.
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Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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