Alzheimer's disease in humans is associated with the deficiency of

In the parasympathetic nervous system,which of the following acts as the neurotransmitter?

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?

Chemicals which are released at the synaptic junction are called

The cause of death in a person bitten by a cobra is:

What is the functional junction between the axon of one neuron and the dendrite of the next neuron called?