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Published byColleen Arendall Modified over 9 years ago
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Fig. 10-3. Myofibrils are surrounded by calcium- containing sarcoplasmic reticulum.
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Fig. 10-7. Review of thin and thick filament structure
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Fig. 10-9. Overview of the process
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The muscle fiber is stimulated.
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Fig. 10-9. Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released.
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Fig. 10-11. “End- on” view of thick & thin filaments, showing the effect of calcium ions after release from the S.R.
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Fig. 10-9. Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released.
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Fig. 10-9. Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere.
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Fig. 10-12 Calcium attaches to troponin/ tropomyosin; they roll away, exposing the active site on actin.
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Fig. 10-12 Myosin cross-bridges attach to active site on actin. After attachment, the cross-bridges pivot, pulling the thin filaments.
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Fig. 10-12 A fresh ATP replaces the ADP+P i, allowing myosin and actin to detach. Energy from the splitting of the fresh ATP allows repositioning of the myosin head.
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Fig. 10-12 This leads back to Step 1, which continues the cycle as long as calcium ions are attached to troponin/tropomyosin.
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Fig. 10-9. Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere.
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Fig. 10-9. Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere. Muscle fiber contracts.
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Fig. 10-9. Overview of the process The muscle fiber is stimulated. Ca 2+ ions are released. Thin filaments move to middle of sarcomere. Muscle fiber contracts. Muscle tension increases.
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