To get muscles contractin, the myosin must pull on the ___

For thin filaments to continue to slide past thick filaments during muscle contraction, myosin heads must pull the actin at the binding sites, detach, re-c*ck, attach to more binding sites, pull, detach, re-c*ck, etc. This repeated movement is known as the cross-bridge cycle.

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answer; i believe that the correct answer is (essential amino acids);

hpv is the answer