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The two filaments that form cross-bridges are?
actin and myosin
During muscle contraction myosin cross bridges attach to which active sites?
actin filaments
What does myosin attach to?
During muscle contraction, myosin cross bridges attach to active sites of ACTIN FILAMENTS.
Does ATP cause the detachment of myosin from actin?
No, ATP does not cause the detachment of myosin from actin. ATP is used to fuel the cross-bridge cycle in muscle contraction, providing the energy needed for myosin heads to form cross-bridges with actin. Detachment of myosin from actin is facilitated by a conformational change in the myosin head when ATP is hydrolyzed.
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.
During skeletal muscle contraction myosin cross bridges attach to active sites of?
During skeletal muscle contraction myosin cross bridges attach to active sites of actin filaments. Actin filaments bind ATP. Their growth is regulated by thymosin and profilin.
Where does the heaof a myosin filament bimd to?
The head of the myosin filament "walks along" the actin filament forming cross bridges between the two.
Myosin cross bridges attach to active sites of?
actin filaments in muscle cells during muscle contraction.
What unlocks the active site of an actin molecule?
The binding of ATP to actin causes a conformational change that exposes the active site for myosin binding. This allows for the formation of cross-bridges between actin and myosin during muscle contraction.
What happens to ATP when it binds to Myosin?
When ATP binds to myosin, it causes myosin to release actin, allowing for muscle relaxation. The energy stored in ATP is used to detach myosin from actin and prepare the cross-bridge for another contraction cycle.
When myosin is attached to actin this is called a?
When myosin is attached to actin, it forms a cross-bridge. This attachment allows for the sliding of actin filaments along myosin filaments, leading to muscle contraction.
Myosin contains two binding sites for what two molecules?
ATP (--> ADP+Pi) and actin
