(a)[3]
The venom of the Indian cobra contains a toxin that produces muscle paralysis in mammals bitten by the snake. The toxin acts at the cholinergic synapses. Suggest ways by which the toxin in cobra venom may cause muscle paralysis.
(b)[3]
Describe the role played by calcium ions in synaptic transmission.
(c)[2]
Synapses reduce the speed of transmission of nerve impulses but also perform an important function in the nervous system. Outline two of the roles of synapses in the nervous system.