[???] ??? ??

x line ??? ????? ?? ???. ??? ??? ????, ?? ????? ???????? ??? ??, ????? ???? ?? ?? ?? ?????? action potential? ????. Action potential? neuromuscler junction? ?? axon terminal??? acethylcholin(ACh)? ????.
??? ACh? motor end plate? receptor? ???? Na+/K+ channel? ??? ??. ??? ???? K+? ? ?? ??? ???? Na+? ?? ?? ??? ????? depolarizing(???)??, end-plate potential(EPP)? ????.
EPP? ??? ????? depolarizing?? ??? ?? ??? action potential? ????. ??? ??? action potential? T-tubule? ?? ??? sarcoplasmic reticulum???? Ca2+? ?????.
??? Ca2+? thin filament? ?? troponin? ???? tropomyosin? ??? ???? actin? myosin binding site? ????.
??? ?? myosin cross bridge? actin? ???? ??. Cross bridge? myosin? ???? ?? ADP? Pi? ????? ???? ??.
??? ATP? ???? myosin ATPase binding site? ???? actin-myosin ??? ??? ??? ??.
ATP??? ??? ADP? Pi? myosin? ???? cross bridge? ??? ???? ??. ??? myosin? actin? ??? ??? ???? ?? ???? ???? ??.
??? ???? ????? Ca2+? Ca-ATPase? ?? ?? sarcoplasmic reticulum?? ???? ??