BIOL3030 Lecture 9: BIOL 3030 Lecture 9: Lecture 9: 2/6/2017: Muscle Physiology I: Structure, contraction, and neutral control
13 Feb 2017
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Middle length: more force than short and long length. Growth plates didnt close because he wasnt sensitive to estrogen. Osteoclasts didnt stop so his bones kept getting longer. Stretch receptors: propireceptors: action potential sent to muscle to induce. Muscle fasicles (bundles): cells (fibers): fibrils (contain moving filaments): filaments (moving past one another): thick and thin: actin and myosin. Contraction: intiated by neruonal influence on cell. Termiansl meet with bunch of muscle cells. Single motor neuron can innervate many muscle cells: motor unit. Motor unuit :motor neuron and all of muscle fibers it innervates. Striated muscle: packed of fibrils: contains fibers. Nucleus in mito: pushed to periphery of cell. Cords: sarcomeres: functional unit of muscle cells. Changes length: composed of actin and myosin: thick and thin. Muscle fibril composed of sarcomeres joined at z disks. Within z disk: thin actin and thick myosin: bind to each other. Filaments dont completely overlap: slide past one another.
