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Published byBraulio Hosea Modified over 9 years ago
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Sliding Filament Theory How do muscles work…..
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Muscle Cell Structure n Muscles are broken into smaller muscle fibers n muscle fibers are broken into smaller units called myofibrils n myofibrils are broken into smaller units called sarcomeres
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Sarcomere Structure - units of muscle contraction n These are made up of alternating thick proteins filaments (myosin) and thin protein filaments (actin) n This pattern forms different zones as shown here
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Close up look at Myosin & Actin n Myosin filaments contain “heads” n Actin filaments contain binding sites n ATP is necessary for the contraction to occur
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“Power Strokes” n Actin filaments slide towards the center of sarcomere when muscle contracts….. Away when it relaxes n Myosin heads attach to binding sites forming cross bridges n when activated the cross bridges tilt inward towards center in a short powerful stroke
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Muscle Contraction n ATP is required for the “heads” to detach and move to the next binding site n A series of power strokes causes noticeable muscle contraction n with no ATP the myosin heads do not detach and RIGOR occurs
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