Walker cards 1.3 0.0 / 5 ? Sports SciencesshghgA2/A-levelAQA Created by: ollie dowellCreated on: 21-06-17 10:53 Aeorbic With oxygen, low to medium intensity exercise, oxygen demand can be met. 1 of 14 Anaerobic Without oxygen, high intensity exercise, demand for oxygen cant be 2 of 14 Hypertrophy The muscles has become bigger and stronger. 3 of 14 Motor Unit A motor unit and its fibres. 4 of 14 Motor Neurons Nerve cells which transmit the brains instructions as electrical impulses to the muscles 5 of 14 Neuromusclaur Junction Where the motor neuron and the muscle fibres meet. 6 of 14 All or None law A sequence of impulses has to be of sufficient intensity to stimulate all of the muscle fibres is motor unit. 7 of 14 Wave Summation There is a repeated nerve impulses with no time to relax so a smooth, sustained contraction occurs rather than twitches. 8 of 14 Tetanic Contraction A sustained muscle contraction caused by a series of fast repeating stimuli. 9 of 14 Spatial Summation When the strength of a contraction changes by altering the number of and size of the muscle motor units. 10 of 14 Muscle Spindles These detect how far and how fast a muscle is being stretched and produce a stretch reflex. 11 of 14 Golgi Tendons These are activated when there is a tension in a muscle. 12 of 14 Isometric Contraction There is a tension in muscle but no visible movement. 13 of 14 Autogenic Inhibition There is a sudden relaxation of the muscles in response to high tension. 14 of 14
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