aplab - TheMuscularSystem:SlidingFilamentTheory

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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____________________. 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. a. Which molecule has a binding site for myosin cross bridges?  _actin ____________________________ b. Which molecule covers this binding site?  __myosin_______________________________________________ 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_______________________ 5.         Hydrolysis of the molecule in question 4 returns the myosin molecule to the              __high energy_______ confirmation. 6.         Binding of the cross bridges sequentially prevents _sliding____________________ 
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aplab - TheMuscularSystem:SlidingFilamentTheory

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