BSC 2011 Chapter Notes - Chapter 33: Cell Membrane, Endoplasmic Reticulum, Microfibril
6 Jul 2016
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Skeletal - voluntary contracting and relaxing- somatic ns. Smooth- involuntary control for long time without fatigue; most efficient use of atp* Generation of pulling forces by sliding filament mechanism- thin actin- dead material (rope in tug of war) Actin and myosin like proteins mediate cell division, cell mobility and organelle transport in many cell types- not only found in muscle cells. Opposing groups- one muscle to raise and the other to lower. Skeletal muscles composed of nested bands of parallel strands- multinucleated cells formed from adjacent cell fusion. Repeated sarcomere units- shortest unit of muscle that can form a force on its own. Thin filaments made of actin, tropomyosin, and troponin. Prevent muscle from contracting- block binding spots for myosin-done by tropomyosin which wraps around actin to block myosin from binding. Intracellular calcium normally low ancts as signal to control proteins when in the cytosol- acts as a signal to bind proteins, eg troponin to allow contraction.
