A nerve impulse travels fastest along ________ axons of ______ diameter.

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A nerve impulse travels fastest along ________ axons of ______ diameter.

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Acacia 5 years 2021-07-25T08:51:55+00:00 1 Answers 155 views 0

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  1. Nem
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    2021-07-25T08:53:36+00:00
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    Question:

    A nerve impulse travels fastest along ________ axons of ______ diameter. (a) Myelinated; small

    (b) Unmyelinated; small

    (c) Myelinated; large

    (d) Unmyelinated; large

    (e) None of the choices; axon diameter does not affect impulse conduction

    Expert Answer

    Answer:

    The correctoption is;

    (c) Myelinated; large

    Explanation:

    The speed of a nerve pulse or the speed of an action potential for example is dependent on the presence of a myelin sheath. In the absence of a myelin sheath, an impulse path way is that of the dendrite or axon. As such the the speed of the impulse is reduced. If however, a myelin sheath is present, then the charges of the impulse are transported through the nodes of Ranvier, hence at much higher speed than an impulse on  a non myelinated neuron. The speed of the impulse is increased as the diameter of the dendrite or axon is increased.

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