Receptors A) may be either a specialized ending of an afferent neuron or a special cell closely associated with the peripheral ending of an afferent neuron. B) are present for every modality in the environment. C) when stimulated bring about opening of Na⁺ channels in the afferent neuron membrane adjacent to the receptor. D) two of these answers. E) all of these answers.

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Quizplus · Accepted Answer

Receptors can be either a specialized ending of an afferent neuron or a special cell closely associated with the peripheral ending of an afferent neuron, and they are present for every modality in the environment. When stimulated, receptors may bring about opening of various ion channels, depending on the type of receptor and the modality being detected. Opening of ion channels may lead to depolarization and the generation of action potentials in the afferent neuron.