The branch-like extensions of a neuron, which receive input from adjacent cells, are known as:

Question

BlackTom AI · Accepted Answer

Dendrites are the branched projections of a neuron that receive synaptic input from adjacent cells, so the correct choice is b. dendrites.

1) Relevant knowledge points and concepts
- Neuron structure: soma (cell body), dendrites, and axon.
- Dendrites: highly branched processes specialized to receive chemical signals (synaptic input) from other neurons and convey incoming electrical signals toward the soma.
- Axon: typically a single long projection that transmits action potentials away from the soma to other cells.
- Myelin sheath: insulating layers produced by glial cells that wrap around axons to speed signal conduction; not a receiving structure.
- Sensory neurons: a functional class of neurons that relay sensory information; not the name of a neuronal extension.

2) Step-by-step reasoning
- The question specifies “branch-like extensions” and “receive input from adjacent cells.” That matches the anatomical and functional description of dendrites (branched, receptive).
- Axons are usually singular, long, and specialized for output (sending signals), so option d is inconsistent with “receive input.”
- Myelin sheath is an insulating covering around axons, not a branch-like structure that receives input, so option c is incorrect.
- Sensory neurons refers to an entire neuron type, not a part of a neuron; option a therefore does not name an extension.

3) Intermediate logical steps
- Identify feature: branch-like = multiple short extensions → candidate = dendrites.
- Identify function: receive input/synaptic contacts → matches dendritic role.
- Eliminate others by mismatch of form/function.

4) Why the correct answer is correct
Dendrites combine the branch-like morphology and the specific role of receiving and integrating synaptic inputs from adjacent cells; this is their defining role in neuronal signaling.

5) Why other options are incorrect (brief)
- a. Sensory neurons: whole neuron class, not an extension.
- c. Myelin sheath: insulating layer on axons, not a receiver.
- d. Axon: transmits output, not primarily for receiving input.

Conclusion: The correct answer is b. dendrites, which matches the provided answer.

The branch-like extensions of a neuron, which receive input from adjacent cells, are known as:单项选择题

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