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C: Calcium binds to troponin. The troponin is a filament in the actin strand, and the active site needs to be uncovered so that the myosin head can bond and therefore pull the muscle to contract it.
Wiki User
∙ 15y ago
Wiki User
∙ 11y agowhen calcium binds to troponin
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What is the actin status to begin cross bridge formation?
The actin binding sites are exposed
What specifically is cross bridge?
myosin binding to actin
Sliding filament model which proteinS have a calcium binding site?
The actin filaments have a Ca+2 binding site.
The ability of myosin to interact with actin is regulated by the binding of?
Ca2+ to troponin
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 molecule has a binding site for myosin heads?
Myosin heads bind to the actin binding site, and also has a part where ATP binds
During muscle contraction myosin cross bridges attach to which active sites?
actin filaments
What muscle cell protein covers the myosin binding sites on actin fimlaments?
tropomyosin
What blocks the binding sites on actin?
TROPOMYOSIN MOLECULES ( troponin hold the tropomyosin in place)
Binding sites on the actin molecules are covered by troponin and?
muscle that produces a give movement
What triggers the binding of myosin to actin?
Calcium ions bind to troponin and change its shape.
What is the name of the protein active in muscular contraction?
actin
