本题目来源于试卷: Interaction & Interdependence C.5 Neural Signaling，类别为 IB生物学
[单选题]
Which two features are more abun qz(vh3z6d,dkhk57 vbdant per unit length kpptr+cf. *gmdh2 r7+in a non-myelinated neuron t2gfc 7+pk.p mr+*trdhhan in a myelinated neuron?
A. Sodium-potassium pumps and synaptic vesicles
B. Potassium ion channels and sodium-potassium pumps
C. Potassium ion channels and sodium-potassium pumps
D. Nodes of Ranvier and Schwann cells
参考答案: B
本题详细解析:
Explanation: Choice B is correct because cell membranes of myelinated neurons largely lack ion channels and pumps in regions of the axon that are myelinated. Choice A is incorrect because synaptic vesicles are not present in axons. Choice C is incorrect because the rough endoplasmic reticulum and Golgi apparatus are present in the cell body, not the axon. Choice D is incorrect because Nodes of Ranvier and Schwann cells are present on myelinated neurons, not non-myelinated neurons.
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