Chapter 9: Muscles and Muscle Tissue

Tropomyosin changes shape so myosin binding sites on actin are uncovered (Fig 10.7) Myosin then can bind to actin. The calcium will also activate ATPase ability of myosin. The ATPase activity of myosin activates its power stroke movement (Fig 10.6) Pulls actin inward (H zones and I bands narrow and may disappear; A band does not change its length) ................
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