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What molecule must bind to to the cross bridge in order for it to disconnect with actin?
Wiki User
∙ 12y ago
The molecule that binds to myosin, which causes it to disconnect, is an ATP molecule
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoATP
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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.
What does calcium bind to priot to cross-bridging?
Actin changes shape.
What is the crossbridge cycle?
The crossbridge cycle is the cyclical formation of links between actin and myosin. This results in the sliding of thin filaments towards the M line of a sarcomere. The myosin head undergoes conformation changes which allows it to swivel back and forth. In its low energy form, myosin has a low affinity for actin. The ATP prepares myosin for binding with actin by moving it to its high energy form position. When myosin contracts, it has a high affinity for actin.
When does cross bridge cycling end?
cross bridge cycling ends when sufficient calcium has been actively transported back into the SR (to allow calcium to unbind from troponin)
What depends on a molecule that can cross the plasma membrane?
The Gonhiqule depends on a molecule and cross the plasma membrane in an animal cell, but is a different story for the plant cell because of the cell wall.
When the cross-bridge of the myosin molecule form linkage with actin filaments the result s what?
shortening of the muscle fiber
What blocks the myosin binding sites on the actin molecule preventing cross bridge formation?
The tropomyosin molecule blocks the active sites of the actin. Troponin is a molecule that is bound to the tropomyosin. Troponin needs CA+ (calcium ions) to bind to it in order to rotate the tropomyosin molecule and expose the actin molecules for the myosin heads to interact for muscle contraction.
What is the actin status to begin cross bridge formation?
The actin binding sites are exposed
When myosin is attached to actin this is called a?
Cross bridge
What specifically is cross bridge?
myosin binding to actin
What the cross-bridge cycling requires?
What cross-bridge cycling requires is ATP, actin, inorganic phosphate, myosin, and ADP.
What is a temporary connection between actin and myosin heads?
Cross bridge
What role does tropomyosin play in cross bridge cycle?
The displacement of tropomyosin exposes the active sites of actin allowing cross bridge to form.
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.
What is the energy that powers the cross bridge on myosin to pull the actin?
the pholsphorilation of ATP to ADP and an inorganic P
What happens to ATP when it binds to Myosin?
Energisation of the head takes place, then cross bridge linkage follows
How does troponin facilitate cross bridge formation?
Troponin controls the position of tropomyosin on the thin filament, enabling myosin heads to bind to the active sites on actin.
