KNES 360 Lecture Notes - Lecture 39: Muscle Biopsy, Axon, Oxidative Phosphorylation

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Em picture can tease out singe muscle cells showing a. mitochondria, b. glycogen, c. myofibrils, triglyceride droplets. Gives us a way to see subcellular substrates that are available for muscle to utilize during exercise: change significantly with acute exercise and exercise training myofibrils don"t change much, unless it is strength training. Did studies on animals to figure it out: humans buchard with twins. Genetics determine which type of motor neurons innervate the individuals muscle fibers: when an animal or human goes through development, their fiber type is dictated by motor neurons that exist in the nervous system. If slow motor neurons, then more type i: but if inherited fast motor neurons, then prob have more fast twitch type 2 muscle fibers. Innerconversions of type 2 is readily seen (not so much from i< ii) In animals effects of continuous activity into late years reduction of fast twitch is reduced.

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