EXCI 252 Lecture Notes - Lecture 7: Muscle Hypertrophy, Myocyte, Bone Mineral
11 Apr 2018
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Document Summary
Systematic program of exercise for the development of the muscular system. Primary outcome: improved strength & muscular endurance: health benefits: muscular strength & endurance. Builds bone mass ( bone denisity and strength, counteracts loss of bone mineral, risk of falls with age) ** does not increase the number of muscle fibers: muscle learning: recruit motor units, increases strength even before muscle size, hyperplasia: increase # of cells. Bundles of muscle fibers (or a single muscle cell): composed of myofibrils (protein structures) Slow twitch: used in endurance activities jogging. Fast-twitch: used in strength & power activities sprinting. The dendrites branch out from the cell body and receive electrochemical signals from the brain and spinal cord. Importance: some motor units contain up to 1000 + muscle fibers. When the alpha motor neuron calls on its muscle fibers to contract, all the fibers contract to their max capacity. Antagonist: a muscle that opposes or resists the action of an agonist.
