A_level Biology and Human Biology, ICAS
1) tropomyosin molecule prevents myosin head from attaching to the binding site on the actin molecule.
2) calcium ions released cause the tropomyosin molecule to pull away from the binding sites on the actin molecule
3) myosin head now attaches to the binding site on the actin filament
4) head of myosin changes angle, moving the actin filament along. the ADP molecule is released
5) ATP fixes to myosin head, causing the myosin molecule to detach from the actin filament
6)hydrolysis of ATP to ADP by ATPase provides the energy for the myosin head to resume its normal position
7)head of myosin reattaches to a binding site further along the actin filament and cycle is repeated
This is an excellent video as it clearly expalins to us the detais of actin-myosin crosslinking. More videos should be like this.
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1) tropomyosin molecule prevents myosin head from attaching to the binding site on the actin molecule.
2) calcium ions released cause the tropomyosin molecule to pull away from the binding sites on the actin molecule
3) myosin head now attaches to the binding site on the actin filament
4) head of myosin changes angle, moving the actin filament along. the ADP molecule is released
5) ATP fixes to myosin head, causing the myosin molecule to detach from the actin filament
6)hydrolysis of ATP to ADP by ATPase provides the energy for the myosin head to resume its normal position
7)head of myosin reattaches to a binding site further along the actin filament and cycle is repeated
This is an excellent video as it clearly expalins to us the detais of actin-myosin crosslinking. More videos should be like this.