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What is released from the myosin head just before the power stroke?
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Flexing the head of this molecule provides what is known as the?
Power stroke
What is the compound that binds myosin and provides energy for the power stroke?
a flowery anus
What is used to detach the myosin head?
ATP is used to detach myosin heads and move them back to position for another "power stroke."
Does myosin have the ability to swivel when powered by ATP?
Yes...ATP causes myosin to detach from actin. Then, Hydrolysis of ATP, which results in ADP and P, causes conformational change in myosin head to swivel or pivot about its axis and then weakly bind to an actin filament. Once the myosin head binds, a conformational change in the myosin head will cause the P to leave (the ADP is still stuck on). The leaving of the P causes the power stroke or "the pulling of the actin filament/rowing stroke". ADP then leaves and the myosin is now back at its original state.
What occurs when actin and myosin filaments slide over each other?
The power stroke of the cross bridge which binds ATP disconnecting it from the actin.
When the myosin head flexes into a bend pulling the actin filament along with it this is called the A. actin reaction B. power stroke C. recovery stroke D. muscle tone E. action potential?
a
How is calcium used in muscle contraction?
Calcium binds to troponin, which moves the tropomyosin out of the way so that myosin can bind to actin; this ultimately causes a power-stroke.
The sliding filament mechanism of muscle contraction involves?
during contraction, the thin filaments slide past the thick filaments so that actin and myosin filaments overlap.
How can gradation of skeletal muscle contraction be accomplished?
controlled output of action potentials, progressive recruitment of motor units, control of the rate of attachment/reattachment of actin and myosin heads and the power stroke rate
Which Muscle movement in myosin heads of the thick filaments pull on the thin filaments causing the thin filaments to slide toward the center of the sarcomere?
Flexing of the cross bridge (power stroke)
What causes muscles to remain in a contracted state called rigor moritis for a brief period of time after the organism dies?
Ca 2+ in sarcoplasmic reticulum is released, exposing actin active sites, which the myosin head to bind to them. This results in the power stroke that contracts muscles. However, the Ca 2+ is still around, keeping the active sites exposed, which means myosin stays locked in. This muscle contraction is what is known as rigor mortis
What stroke of a 4 stroke engine provides power to the crankshaft?
the power stroke
