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Which of the following statements about the response of neurones to stimulus is correct?

Biology
WAEC 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 Answer: Option D
Explanation

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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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709