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Unformatted text preview: The Muscular System Energy for Contraction * ATP- immediate source of energy that last for only 5 seconds * Creatine Phosphate- high energy molecule that is used to make ATP. * Makes enough energy to last for about 15 seconds * Glycogen- storage form of glucose * with oxygen can use the glycolytic-Krebs cycle pathway to produce ATP (aerobic respiration) * most efficient method of energy production * without oxygen can use glycolytic pathway with end product of lactic acid (anaerobic respiration) * can provide enough energy for 30 seconds of maximal activity All or None Principle * Threshold stimulus- the weakest stimulus from a neuron that can still initiate a contraction. * All-or-none principle- when stimulated, a motor unit will contract to its fullest; a motor unit cannot partially contract. * When a whole muscle contracts, not all motor units are contracted. The more strength that is needed, the more motor units that are recruited. Muscle Tissue and Homeostasis * Oxygen Debt * during exercise, the muscles must have an increased supply of oxygen *...
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- Fall '10