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Energisation of the head takes place, then cross bridge linkage follows
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ADP molecules on the surface of actin serve as active sites for the formation of cross bridges with molecules of?
ATP not ADP binds to actin-myosin and is cleaved by to ADP.
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.
Does ATP cause the detachment of myosin from actin?
Yes
Atp allows what filaments to release and reset?
myosin?
Which step allows actin and myosin to release from each other?
an ATP molecule attaches to myosin apex answers
Which molecule binds to the myosin head in order to break the actin-myosin bond?
ATP
What causes cross bridge detachment?
ATP binds to the myosin head
What causes cross bridge detachment in after a power stoke?
ATP binds to the myosin head.
What molecule has a binding site for myosin heads?
Myosin heads bind to the actin binding site, and also has a part where ATP binds
What molecule must bind to to the cross bridge in order for it to disconnect with actin?
The molecule that binds to myosin, which causes it to disconnect, is an ATP molecule
What do muscle fibers need to reset the myosin heads?
ATP binds myosin, allowing it to release actin and be in the weak binding state (a lack of ATP makes this step impossible, resulting in the rigor state characteristic of rigor mortis). The myosin then hydrolyzes the ATP and uses the energy to move into the "cocked back" conformation.
ADP molecules on the surface of actin serve as active sites for the formation of cross bridges with molecules of?
ATP not ADP binds to actin-myosin and is cleaved by to ADP.
What is the role of atp in muscle concentration?
Atp plays a critical role in muscle. Breaking of the cross-bridge is possible only if atp binds to myosin, thereby allowing it to be free for the following contraction.
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.
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 are overlapping patterns of actin and myosin called?
binds
What happens to calcium ions and tropomyosin to cause a muscle to relax?
Calcium ions are pumped back into the sarcoplasmic reticulum. A free ATP will come in and restore the myosin head back to 90 degrees preparing it again for another powerstroke. It's important to note that the myosin head does NOT hydrolyze the ATP. Only in a powerstroke it will hydrolyze the ATP to use the energy to bend the myosin head 45 degrees. If there is no free ATP to release the myosin head from it's bent angle then it remains rigid. That is why when a person dies their muscles stiffen because there are no free ATP to release the myosin heads from the actin filament.
