Put these steps in neuromuscular junction synaptic transmissionand excitation-contraction coupling in chronological order. (Typethe letters in the appropriate order with no spaces betweenthem).
A. Ryanodine receptors open
B. Voltage-gated Na+ channels open in the muscle cell membranenear the neuromuscular junction
C. Tropomyosin rotates into the groove of the thin filament (outof the way of the myosin binding site)
D. Depolarization of motoneuron axon terminal
E. Ca2+ dissociates from troponin
F. [Ca2+] rises in the muscle cell cytoplasm
G. An EPSP occurs in the muscle cell
H. Myosin heads go through the cross-bridge cycle and hydrolyzeATP
I. An action potential is conducted along the T-tubule
J. Acetylcholine receptors open and conduct Na+ ions
K. Ca2+ binds to Troponin
L. Vesicles containing acetylcholine fuse with nerve cellmembrane
