All-or-nothing Principle & the Refractory Period (AQA A-Level Biology): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does the all-or-nothing principle describe?
What does the all-or-nothing principle describe?
Nerve impulses as complete responses
What happens if a stimulus falls below the threshold value?
What happens if a stimulus falls below the threshold value?
No action potential occurs
How do action potentials produced by a neurone compare in size?
How do action potentials produced by a neurone compare in size?
They are essentially identical
How does frequency coding detect stronger stimuli?
How does frequency coding detect stronger stimuli?
More action potentials per time period
What is recruitment in stimulus detection?
What is recruitment in stimulus detection?
Activating neurones with higher thresholds
What is the refractory period?
What is the refractory period?
Recovery phase after action potential
Why does the refractory period occur?
Why does the refractory period occur?
Sodium channels must reset
How does the refractory period ensure unidirectional propagation?
How does the refractory period ensure unidirectional propagation?
Region behind impulse is unresponsive
What function does the refractory period have on impulse frequency?
What function does the refractory period have on impulse frequency?
Limits maximum frequency
How is stimulus intensity encoded in neural signals?
How is stimulus intensity encoded in neural signals?
Through impulse frequency and timing