Interaction & Interdependence C.5 Neural Signaling (id: 242d1f9ba)

本题目来源于试卷: Interaction & Interdependence C.5 Neural Signaling，类别为 IB生物学

[单选题]
The diagram shows tweii yl/hjj0-m ebg 7p7jmb 0ov5u.3h(o )f1vw4oo4g 1,uxcuc ineurons of equal length and diameter. Which neuron will transfer an electrical 4wg u fv,ioco4x1u )c1impulse faster?

A. Neuron is X ; Reason is because it has more dendrites
B. Neuron is Y ; Reason is because it is unmyelinated
C. Neuron is X ; Reason is because it is myelinated
D. Neuron is Y ; Reason is because it has more axon terminals


参考答案:  C


本题详细解析:

Explanation​:

Electrical impulses can jump between nodes of Ranvier (the gaps in the myelin sheath) in a process called saltatory conduction, this process is faster than continuous transmission along a fibre, Choice C is correct.

Choice A is incorrect as neurons X and Y have the same number of dendrites, and neuron Y is unmyelinated. Choice B is incorrect, as unmyelinated neurons have a slower rate of electrical transmission. Choice D is incorrect as it is myelination, not the number of axon terminals, that speeds up electrical transmission.

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