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Muscle contraction results
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∙ 12y ago
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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
Myosin cross bridges attach to active sites of?
actin (thin) filaments
What does myosin attach to?
During muscle contraction, myosin cross bridges attach to active sites of ACTIN FILAMENTS.
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.
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.
Where do myosin cross bridges attach during muscle contraction?
Myosin functions as an ATPase utilizing ATP to produce a molecular conformational change of part of the myosin and produces movement. Movement of the filaments over each other happens when the globular heads protruding from myosin filaments attach and interact with actin filaments to form crossbridges. The myosin heads tilt and drag along the actin filament a small distance (10-12 nm). The heads then release the actin filament and adopt their original conformation.
When myosin is attached to actin this is called a?
Cross bridge
What specifically is cross bridge?
myosin binding to actin
What happens to ATP when it binds to Myosin?
Energisation of the head takes place, then cross bridge linkage follows
Does a muscle contract during cross bridging?
Yes, it does. During a contraction, myosin heads interact with actin filaments to form cross-bridges. The myosin head pivots, producing motion. Thick filaments contain titin strands that recoil after stretching.
