The motor unit 0.0 / 5 ? Physical EducationAnatomy & physiologyA2/A-levelAQA Created by: Megan66Created on: 28-10-16 17:01 Repeated nerve impulses with no time to relax creates a smooth,sustained contraction rather than twitches Wave summation 1 of 7 A sequence of impulses with sufficient intensity to stimulate all of the muscle fibres. If the intensity is not enough, none of them contract. All or none law 2 of 7 A nerve cell forming part of a pathway along which electrical impulses pass from the brain to the muscles Motor neurones 3 of 7 Where the motor neurone and the muscle fibre meet Neuromascular junction 4 of 7 A motor neurone and its muscle fibres Motor unit 5 of 7 The strength of a contraction changes by altering the number and size of the muscles motor units Spatial summation 6 of 7 A sustained muscle contraction from a series of fast repeating stimul Tetanic contraction 7 of 7
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