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muscledropboxassignment - TheMuscularSystem: 1.a. MYOSIN b....

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The Muscular System: Sliding Filament Theory 1. a. The thick filament is composed of what molecule?  MYOSIN b.  Flexing the head of this molecule provides what is known as the            “POWER STROKE” FOR MUSCLE CONTRACTION 2. The cross bridge (myosin head) contains binding sites for what two  molecules? a.ATP b.actin 3. Three molecules make up the thin filament.  Actin, tropomyosin, and  troponin a. Which molecule has a binding site for myosin cross bridges?  actin b. Which molecule covers this binding site?  tropomyosin c. Which molecule has a binding site for calcium ions?  troponin 4. What molecule must bind to the cross bridge in order for it to disconnect  with  actin?   atp
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5. Hydrolysis of the molecule in question 4   returns the myosin molecule to the  original confirmation. 6. Binding of the cross bridges sequentially prevents  sliding of the thin filament. 7. Name three roles for ATP in the contraction of muscle.
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