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Questions and Answers
During which step of crossbridge cycling do myosin heads pull thin filaments toward the center of the sarcomere?
During which step of crossbridge cycling do myosin heads pull thin filaments toward the center of the sarcomere?
- Reset of a myosin head
- Release of a myosin head
- Crossbridge formation
- Power stroke (correct)
In muscle contraction, what causes the release of a myosin head from actin?
In muscle contraction, what causes the release of a myosin head from actin?
- ATP binding (correct)
- Conformational change of troponin
- Reset of the myosin head
- ADP & Pi binding
Which factor is essential for the continuation of cycling in muscle contraction?
Which factor is essential for the continuation of cycling in muscle contraction?
- Tropomyosin & troponin
- ATP & actin
- Calcium (Ca++) & ADP
- Calcium (Ca++) & ATP (correct)
What is the action of Tetanus, caused by toxins from Clostridium tetani?
What is the action of Tetanus, caused by toxins from Clostridium tetani?
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What is the consequence of moving the troponin-tropomyosin complex, exposing the myosin-binding site on actin?
What is the consequence of moving the troponin-tropomyosin complex, exposing the myosin-binding site on actin?
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What occurs when ADP & Pi are released during muscle contraction?
What occurs when ADP & Pi are released during muscle contraction?
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