Wave Summation - Increased frequency of impulse to achieve a strong contraction, Spatial Summation - Rotating the impulse for sustained contraction, ACH - Transmitter substance to take impulse over the synaptic cleft, Synaptic cleft - Gap which exists between the neurone and muscle fibre, All or None Law - Strength of contraction is dependent on strength of stimulus, Depolarisation - Axon is ready to receive an impulse, Sacroplasmic Reticulum - Exists in sarcoplasm to regulate the release of calcium, Motor Unit - A neurone and the connected muscle fibres, Nodes of Ranvier - Site of ion exchange, Tetanic - Maximum contraction in the muscle is achieved,

Strength of Muscle Contraction - A2 PE

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