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 statement explains why a nerve impulse in -mb1qj:c3p zqnb*-l/atv1 rs electrical?t z4vx,sgk)/4+ zhu /nkoyd4r
A. It releases hormones from glands into the bloodstream
B. Neurotransmitters carry electrical charge between neurons
C. Electrons jump from node to node as electrical signals are transferred across neurons
D. It involves the movement of positively charged ions
参考答案: D
本题详细解析:
Explanation: A nerve impulse is described as electrical because it involves the movement of positively charged ions, which causes a charge imbalance, Choice D is correct. Choice A is incorrect as it describes how chemicals are released via the endocrine system. Choice B is incorrect as neurotransmitters do not carry electrical charges themselves, they just trigger an action potential when they bind to receptors on the postsynaptic membrane. Choice C is incorrect, as nerve impulses are primarily carried by the movement of positive ions across the cell membrane, not electrons.
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