Neural Control And Coordination Question 53
Question: Four events in the transmission of nerve impulses across synapses are given below.
(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?
Options:
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)
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Answer:
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.
BETA
