Quiz: The 'All or None' Law in Muscle Contraction
OCR H555 A-Level Physical Education
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Welcome! You've already studied muscle roles, types of contraction, and motor units. Today, we'll build on this by testing your understanding of the 'All or None' Law in muscle contraction.
What does the 'All or None' Law state?
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Which of the following are true about the 'All or None' Law? (Select all that apply)
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A muscle fibre contracts fully when the stimulus reaches the {{blank0}} threshold, following the {{blank1}} Law.
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Match the items on the left with their correct pairs on the right
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A motor unit contains 15 muscle fibres. If the stimulus reaches the threshold, how many fibres will contract?
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Which part of the nervous system generates the action potential needed for muscle contraction?
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Match the items on the left with their correct pairs on the right
Which factors affect whether a muscle fibre contracts? (Select all that apply)
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What happens if the stimulus is below the threshold for a muscle fibre?
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