Lecture 32 - Kin 110Lecture #32 Wednesday April 28th, 2010...

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Kin 110—Lecture #32 Wednesday April 28 th , 2010 Muscles are bundles of individual fibers. Each fiber a single elongated cell. Muscle cells are subdivided into Myofibrils. o Within the myofibrils are called sarcomeres. Within the sarcomeres are made up of actin and myosin filaments. (Muscle fibers myofibrils sarcomeres actin and myosin) Stimulus by motor neuron causes actin and myosin to interact Sarcomeres shorten and produce force 3 main types of muscle fibers: Type I Small Slow contraction Low glycogen and Creatine Phosphate Many mitochondria Fatigue-resistant Type II A High glycogen and Creatine Phosphate variable in mitochondria, less fatigue- resistant Type II B High in glycogen and creatine phosphate Few mitochondria Not fatigue resistant *ALL MUSCLES ARE A MIX OF FIBER TYPES Muscles that show large gains in size with training usually have high % of Type-II fibers Hypertrophy = increasing muscle size Stimuli for hypertrophy
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Lecture 32 - Kin 110Lecture #32 Wednesday April 28th, 2010...

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