Which of the following hormones act as neurotransmitters?

Define/Explain the following terms:
$(1)$ Synapse
$(2)$ Node of Ranvier

In a chemical synapse,the transmission of nerve impulses is mediated by:

Which of the following does not act as a neurotransmitter?

Chemicals which are released at the synaptic junction are called

Five events in the transmission of a nerve impulse across a synapse are given below:
$a.$ Certain ion channels open,allowing ions to enter and generate a new action potential in the post-synaptic neuron.
$b.$ Neurotransmitter molecules bind to receptors on the post-synaptic membrane.
$c.$ Synaptic vesicles fuse with the pre-synaptic membrane,and the neurotransmitter is released into the synaptic cleft. Depolarization of the pre-synaptic membrane is induced.
$d.$ An action potential reaches the axon terminal.
What is the correct sequence of these events?