13. Thick Filaments: Myosin Structure & Heads

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10 Terms

1
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What protein molecules compose myosin filaments?
Myosin molecules
2
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What are the three structural regions of a myosin molecule?
Head, tail, hinge
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What are the three functional roles of myosin heads?

  1. Binds G-actin, 2. Pivots, 3. ATPase activity


4
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What specific site on actin do myosin heads bind?
Active site on G-actin
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What mechanical movement is performed by myosin heads during contraction?
Pivot
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What enzymatic role do myosin heads perform?
Act as an ATPase
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What molecule does the ATPase of a myosin head break down?
ATP
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What products are generated by ATP hydrolysis at the myosin head?
ADP and 1 phosphate
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What biochemical process releases energy from ATP at the myosin head?
ATP hydrolysis
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What cellular process utilizes the energy released by ATP hydrolysis?
Contraction