Biology 2601A/B Lecture Notes - Lecture 21: Hydrolysis, Chondrichthyes, Hydrostatic Skeleton

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Vertebrate muscle types: muscle types are described by they"re appearances. Smooth: digestive tract, reproductive tract, urinary tract, blood vessel, eye, hair/feathers. Striated: movement through contraction, cardiac, mononucleated cells, pump blood, skeletal, multiple nulei/cell, movement of body & appendages. Sarcomere is the contractile element of all striated muscle. Its contained within the boundaries of z-lines: coming out of the z-line is a protein called titin that attaches to the thick filaments. So the thick filament does not attach directly to the z-line: but the thin filaments do, titin; from z-disc to m-line stabilizes thick filament; compressible, nebulin; stabilizes thin filament. Figure: what are the different proteins doing in the different conditions of the sarcomeres, muscles are made up of myofibrils (muscle cells, myofibrils are made up of cereal additions of sarcomeres. So when all the sarcomeres contract then the whole myofibrils contract which makes the whole muscle contract. In both skeletal and cardiac muscle (not smooth)

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