Muscle contractions

Muscle contractions
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  • Oh really? So does this happen when we workout?
  • During muscle contraction  the thin actin filaments slide over the thick myosin filament. When Calcium is present the blocked active site of the actin clears. 
  • Yes, anytime you exercise. During muscle contraction the thin actin filaments slide over the thick myosin filament. When Calcium is present the blocked active site of the actin clears. 
  • Oh yeah! When a sarcomere contracts, the Z discs move closer together, and the I band becomes smaller.
  • Step B: Power stroke: myosin head pivots pulling the actin filament toward the center. 
  • I remember learning about this now.
  • Step C: The cross bridge detaches when a new ATP binds with the myosin.
  • In the first step in the process of contraction doesn't Calcium bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands?
  • Thanks for jogging up my memory about this!
  • Yes you are correct!
  • Now let's get to playing!
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