... undergo the same process, thereby the impulse is sent along the neurone towards the muscle * A.p occurs in "all or nothing" principle. It doesn't matter how strong the impulse is * Speed of the impulse depends on the neurone ( myelin sheath) Transmissions of active muscles * Neurones communicate with muscle via a SYNAPSE. This is a gap that the impulse cant jump * The A.P release a transmitter substance (acetyl Choline) which received by the receptors on the muscle causing a Muscle Action potential. This passes into the muscle causing the release of calcium * In big muscles 1000's of fibres receive instruction in smaller muscles there are fewer fibres pre neurone * Again ' All or one' of the muscle fibres will contract for a functions of second ( muscle twitch) * The next stimulus will occur before the effect of the first has diminished hence tension rises Wave simulation ...

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