The rate at which a nerve impulse travels along a nerve fiber is dependent up on

Length of the nerve fibre

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Diameter of the nerve fibre

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Presence of connective tissue sheath

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None of the above

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Solution

The correct option is B Diameter of the nerve fibre
Increased axon diameter in axons leads to increase action potential velocity. As there is an increase in diameter of a fibre, its internal resistance decreases. The internal resistance decreases faster relative to the membrane resistance - therefore the distance the membrane potential can travel is increased by an increased diameter. So, the correct answer is option B.

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