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Questions and Answers
What is the definition of a motor unit?
What is the definition of a motor unit?
- A group of muscle fibres contracting at once
- A single muscle fibre and its neural stimulus
- A cluster of motor neurons innervating a single muscle fibre
- A single motor neurone and all the muscle fibres it innervates (correct)
What is the characteristic of a motor unit?
What is the characteristic of a motor unit?
- Motor units innervate individual muscle fibres
- Muscle fibres contract sequentially in a motor unit
- All the muscle fibres in a motor unit contract at once (correct)
- Motor units are selectively recruited for single muscle fibres
What is a twitch in the context of muscle fibre contraction?
What is a twitch in the context of muscle fibre contraction?
- The relaxation phase of muscle contraction
- A sustained muscle contraction
- The mechanical response of a muscle fibre to a single action potential (correct)
- The maximum force generated by a muscle fibre
What determines the graded muscle response?
What determines the graded muscle response?
What is the smallest functional unit of a muscle group?
What is the smallest functional unit of a muscle group?
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