Nervous system help. (Fill in the blanks)?

Question

Think question relates to Synapses,

An impulse can travel in one direction only across a synapse because _________ is inactivated by an _________ and then reabsorbed by the _________ neuron to make new _________.

Answer 1

acetylcholine

acetylcholinerase

..reabsorbed by the pre-synaptic neuron

acetylcholine?

woah..actually, i'm waiting to hear other answers too..