(2)Molecular structure of myofilament 1) Thick myofilament: Myosin(肌球蛋白) Myofibril a PUUUU H zone Myosin tail (c)Thick filaments (d)My osin molecule(2) Molecular structure of myofilament 1)Thick myofilament: Myosin（肌球蛋白)