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In effect, the "Push" does happen automatically when the muscle relaxes. The muscle itself does not push and cannot push, but it sets off the connected bones from the adjoining joint/s after its contraction. It's the same as firing a gun or a catapult or a rubber band - create big tension in the contraction or pull, and let go suddenly, and there ...


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Relaxation of vertebrate skeletal muscle is thought to occur in the absence of ${Ca}^{2+}$ as a result of tropomyosin physically blocking the binding of myosin to actin. This steric blocking model of muscle relaxation predicts that myosin subfragment 1 (S-1) will not bind to actin under conditions where the acto-S-1 ATPase rate is inhibited.[1] However, in ...


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