Question on: WAEC Biology - 2018
Which of the following statements about the response of neurones to stimulus is correct?
A
Neurons respond to stimulus of any strength
B
Neurons respond to all stimuli applied in rapid succession
C
Neurons respond more rapidly during the absolute refraction period
D
Intensity of stimulus must reach a threshold value before the neurons can be excited
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Correct Option: D
Each neuron has a threshold that must be met before an action potential travels the length of the neurons axon. In other words, the neurons don't just begin to act immediately, there is a threshold value where the intensity of the stimulus must get to in order to yield a response from the neuron. This is why you can consciously pinch your self and not feel anything serious but when it is unconscious, it gives you serious pain.
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