Note 2 - Biology 101 3/25/08 Muscle I. Muscle Structure...

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Biology 101 3/25/08 Muscle I. Muscle Structure      Muscle composed many bundled fibers: fibers bundled into fiber bundled into  fibers        single muscle fiber larger multinucleated cell      Cell contains bundled myofibrils      Myofibrils are made up of proteins        primarily actin and myosin        troponin and tropomyosin   A. Structure of Myofibrils       Arrangement of proteins critical to function       Actin/myosin interaction         produce contraction       Troponin/tropomysin interactions         control contraction       Organized into sarcomeres         actual unit of contraction         sarcomeres will shorten/lengthen   C. Unit of Contraction        (Image)                             II. Sliding Filament Model       Myosin head interacts with actin by forming a cross- bridge       Myosin heads ratchets along actin fibers
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This note was uploaded on 03/28/2008 for the course BIO 101 taught by Professor Gold during the Spring '08 term at University of Indianapolis.

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Note 2 - Biology 101 3/25/08 Muscle I. Muscle Structure...

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