steps of cholinergic neurotransmission
a. ____________ delivered into presynaptic neuron by ATP-Na transport system and reacts with enzymes to make ____________
b. ____________ enters ____________ to avoid degradation
c. action potential causes voltage sensitive ____________ channels to open, allowing the ion to enter the axon; influx causes vesicle to fuse with membrane and Ach to enter ____________
d. Ach binds to ____________ receptor, causing cholinergic response; Ach binds to ____________ receptors, inhibiting more Ach release
e. ____________ breaks Ach into choline and acetate
f. free choline taken up by presynaptic neuron