Kinesiology 2230A/B Lecture Notes - Adipose Tissue, Sarcomere, Dystrophin

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Muscle fibres are a single cells made up of myofibrils: there are more than 430 muscles in the body. Opposing pairs agonist and antagonist muscles. Fibre types (twitch time = when the muscle is stimulated how long it takes to shorten/relax) Fog/fta: faster twitch, both glycolytic and oxidative capacity. Not producing as much lactate, advantageous to athletes. Fg/ftb: fast glycolytic fibres, largest fibres in cross sectional area, very little oxidative capacity. Recruitment of fibres: use is related to the force required. More recently they have started to differentiate the fast twitch fibres of animals vs humans (type. 2x/2b: the 2b fibres in the animal world are very glycolytic, zero oxidative capacity, whereas the 2x fibres in humans have a little oxidative capacity, not nearly as much as the 2a fibres. Cardiac: myocardium, heart muscle, combination of nervous system and endocrine (epinephrine) system control.

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