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Unformatted text preview: -Third, how is this interaction regulated?-First, what are these filaments made of?-Thick filament o Made of a protein called myosin o A long chain with double heads-Thin filaments o Made of a protein called actin o Each red sphere is an actin protein o Pearls on a string-Second, how do these filaments interact?-Myosin heads interact with actin o Deatch-extend-attach-pull-repeat-Step 1: ATP binds to myosin head, causes release from actin-Step 2: ATP hydrolysis extends myosin head-Step 3: Myosin head attaches to actin-Step 4: Power stroke slides thin filament toward the center-Third, how is this interaction regulat-Muscle Fibers o Use lots of ATP o What do cells use to make ATP? -Many mitochondria-Glucose is stored in muscle cells as glycogen-Oxygen is stored in muscle cells Muscle Disease-Muscle dystrophy-d-d-d-d-d-d-...
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- Spring '08
- Biology, filaments, single muscle cell