Given an account of synaptic transmission.

Synapse is the junction between two neurons through which nerve impulse is transmitted.
There are 2 types of synapses.

• Electrical synapses: These synapses are very close and also called “gap Junctions”. Impulse transmission is faster.
• Chemical synapses: Membranes of pre and post synaptic neurons are separated by synaptic cleft. When impulse reaches the axon terminal, voltage gated calcium channels open.
  Calcium ions stimulate the release of neurotransmitters from synaptic vesicles.
  Neurotransmitters bind to ligand gated channels. It causes post synaptic potentials.