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Reginald
18 June, 08:12
A muscle contraction usually begins when
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Poncho
18 June, 09:17
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For a contraction to occur there must first be a stimulation of the muscle in the form of an impulse (action potential) from a motor neuron (nerve that connects to muscle). Note that one motor neuron does not stimulate the entire muscle but only a number of muscle fibres within a muscle.
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