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What is the compound that binds myosin and provides energy for the power stroke?
Adenosine triphosphate (ATP) is the compound that binds to myosin and provides the energy needed for the power stroke in muscle contraction. Myosin hydrolyzes ATP to ADP and inorganic phosphate during the power stroke, releasing energy that enables the myosin head to move along the actin filament.
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."
What are the molecules are attached to the myosin head from the previous cycle of movement?
Molecules attached to the myosin head from the previous movement cycle are inorganic phosphate and ADP (adenosine diphosphate). These molecules are released when the myosin head binds to actin, leading to the power stroke of muscle contraction.
At what stage in the cross-bridge cycle is ATP split into ADP and Pi?
ATP is split into ADP and Pi during the cocking stage of the cross-bridge cycle, which is also known as the power stroke preparation phase. This occurs after myosin heads bind to actin and prior to the power stroke.
What causes the power stoke in muscle contractions?
The power stroke in muscle contractions is primarily caused by the interaction between actin and myosin filaments within the muscle fibers. When calcium ions are released into the muscle cell, they bind to troponin, causing tropomyosin to shift and expose binding sites on actin. Myosin heads then attach to these sites, forming cross-bridges. The power stroke occurs when the myosin heads pivot, pulling the actin filaments inward, which shortens the muscle fiber and generates force.
Where in the cross bridge cycle does ATP hydrolysis occur?
ATP hydrolysis occurs during the cocking stage of the cross bridge cycle, where the myosin head is cocked back into its high-energy position before it can bind to actin and perform the power stroke.
After cross bridged formation the myosin head pivots toward the M Line the action is called?
The action of the myosin head pivoting toward the M line after cross-bridge formation is called the "power stroke." During this process, the myosin head pulls the actin filament inward, resulting in muscle contraction. This movement is fueled by the hydrolysis of ATP, which provides the energy necessary for the myosin head to change its conformation and perform the stroke.
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
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 provides the energy to swivel the head of myosin?
The energy to swivel the head of myosin is provided by ATP (adenosine triphosphate) molecules. ATP is hydrolyzed to ADP (adenosine diphosphate) and inorganic phosphate during the power stroke of muscle contraction, releasing energy that causes the myosin head to swivel and slide along actin filaments.
What are the key steps involved in the crossbridge cycle during muscle contraction?
During the crossbridge cycle in muscle contraction, the key steps involve the binding of myosin to actin, the power stroke where the myosin head pivots and pulls the actin filament, the release of ADP and inorganic phosphate, and the resetting of the myosin head for the next cycle.
