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Which of the following types of neurons does not have a relatively high density of voltage-activated sodium channels close to where the axon joins the nerve cell body?  an autonomic neuron innervating smooth muscle in a blood vessel in the hand   an interneuron projecting up the spinal cord   a nociceptor innervating the tip of the thumb   a motor neuron innervating the biceps brachii muscle   a cortico-spinal interneuron

Question

Which of the following types of neurons does not have a relatively high density of voltage-activated sodium channels close to where the axon joins the nerve cell body?  an autonomic neuron innervating smooth muscle in a blood vessel in the hand   an interneuron projecting up the spinal cord   a nociceptor innervating the tip of the thumb   a motor neuron innervating the biceps brachii muscle   a cortico-spinal interneuron

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Solution

An autonomic neuron innervating smooth muscle in a blood vessel in the hand.

This type of neuron does not have a high density of voltage-activated sodium channels close to where the axon joins the nerve cell body. The reason is that autonomic neurons, which control involuntary functions such as blood vessel dilation and constriction, do not need to generate action potentials as rapidly or frequently as other types of neurons. Therefore, they do not require a high density of these channels.

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