| (i) Depolarisation of the presynaptic membrane. |
| (ii) Propagation of postsynaptic action potential. |
| (iii) Hydrolysis of transmitter substance. |
| (iv) Rupturing of synaptic vesicles. |
| In which sequence do these events occur? |
A) (i)\[\to \](iii) \[\to \] (ii) \[\to \] (iv)
B) (i)\[\to \](iv)\[\to \](ii) \[\to \] (iii)
C) (iv)\[\to \](i)\[\to \](iii)\[\to \](ii)
D) (iv)\[\to \](iii)\[\to \](i)\[\to \] (ii)
Correct Answer: B
Solution :
[b] The presynaptic membrane is first depolarised, stimulating the release of acetylcholine, the transmitter substance. This diffuses to the postsynaptic membrane, propagating the nervous stimulus. Acetylcholine is then hydrolysed.
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