11MuscleTemplate - Title: Muscle I. Muscle Structure Muscle...

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Title: Muscle I. Muscle Structure Muscle types: Cardiac, Smooth, Striated (skeletal) Muscle composed many bundled fibers o Fibers bundled into fibers into fibers… o Single muscle fiber large multinucleate cell Cell contains bundled myofibrils Myofibrils are made up proteins: o Primarily actin and myosin o Also includes troponin and tropomyosin A. Structure of Myofibrils Arrangement of proteins critical to function Actin/myosin interactions o Produce contraction Troponin/tropomyosin interactions o Control contraction Organized into Sarcomeres o Actual unit of contraction o Sarcomere will shorten/lengthen -Thin filaments are composed of the globular protein actin (Fig 47.13) -Thick filaments are composed of twisted chains of myosin molecules that have globular club shaped heads. C. Unit of Contraction Structure of sarcomere (LOOK AT FIG 47.11!!!) Sacromere I band I band Myosin Z line A band II. Sliding Filament Model Myosin head interacts with actin by forming a cross-bridge
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This note was uploaded on 04/22/2008 for the course BIOL 111 taught by Professor Dr.zielinski during the Spring '08 term at Purdue University-West Lafayette.

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11MuscleTemplate - Title: Muscle I. Muscle Structure Muscle...

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