HISTOLOGY
NERVOUS TISSUE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A nerve fiber produces either a complete action potential or no action potential at all no matter how large the stimulus.
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -An action potential in the nerve fibre is produced when positive and negative changes on the outside and the inside of the axon membrane are reversed because. more potassium ions enter the axon as compared to sodium ions leaving it.
Detailed explanation-2: -The action potential is said to be all-or-nothing because it occurs only for sufficiently large depolarizing stimuli, and because its form is largely independent of the stimulus for suprathreshold stimuli. In some neurons, a single action potential can be induced by the offset of a hyperpolarizing stimulus (Fig. 1b).
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