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PowerPoint PresentationSlide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Steps in Cross-bridge CyclingMuscle Organization – Review•Highly repetitive–Multiple heads on each myosin molecule–Multiple thin filaments per thick filament –Many thick-thin units per sarcomere–Many sarcomeres per myofibril–Multiple myofibrils per muscle fiber–Multiple muscle fibers per bundle (= fascicle)–Multiple fascicles per muscle•Repetitive structure acts as force multiplier –capable of large, extremely powerful contractions–Actual strength depends on several
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