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– Nelson Mandela

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Lab 5 EMG Worksheet

Lab 5 EMG Worksheet

Q 1.What is the source of the signal for an EMG? 2. 2. What happens to the amplitude for the EMG (mV) as clench force increases? Explain why this occurs using and defining proper terminology (recruit, motor units, muscle fibers).

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1. The source of signal is from the electrical activity of muscles and the action potentials that are generated along the muscle’s plasma membrane or the sarcolemma .2.As the clench force increases there is an activation of the active motor units . This produces an increased amplitude in the EMG because there is an increased electrical impulse that is produced by the motor units and muscle fibres .