Term
| What is the term for one alpha motor neurone and all its corresponding muscle fibres? |
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Definition
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Term
| What features differentiate a fast from a slow motor unit? |
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Definition
| A fast unit has a larger faster nerve, more and larger muscle fibres, faster contraction driven by glocolysis(rather than oxidation) and higher fatigueability |
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Term
| As muscle force increase in what pattern are more motor units recruited? |
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Definition
| From small to large, this is the size pronciple |
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Term
| What are the two ways of increasing muscle force? |
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Definition
| Increasing contraction of a single motor unit and recruting more units |
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Term
| What are muscle spindles? What are their roles? |
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Definition
| They are muscular stretch receptors. They activate reflexes and are used in proprioception |
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Term
| What is the stretch reflex? |
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Definition
| When fatigue occurs and lower limb flexes inwards, stretch of opposing muscle is detected by a muscle spindle. A 1a afferent delivers an AP to the spine and interneurons stimulate and inhibit alpha motor neurones which restore balance. |
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Term
| Which motor neurones control the activation of muscle spindle reflexes? |
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Definition
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