EHS 350 Lecture Notes - Lecture 3: Skeletal Muscle, Myocyte, Cell Membrane
19 Jun 2017
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Functions of muscle tissue: produce movement, maintain posture - muscles are slightly tensed to maintain joint position, stabilize joints - tendons go across joints and stabilize them, produce body heat, ex. shivering if cold. Skeletal muscle every muscle is an organ a lot of ct large blood supply large nerve supply. Fascicules - muscle fibers present in bundles each fascicle surrounded by layer of ct (perimysium) Each muscle fiber in muscle surrounded by layer of ct ( endomysium) All these ct sheaths are continuous with tendons. Skeletal muscle cells skeletal muscle cell is muscle fibers sarcolemma - the plasma membrane cytoplasm is the sarcoplasm. Multiple nuclei stores sugar (glycosomes) often have myoglobin. Myofibrils each cell is filled w/ myofibrils each myofibril is made up of myofilaments skeletal muscle is striated b/c myofibrils are striated line up their striations. I band - white lines sarcomere - makes up i band.
