Question

For minor surgeries in the body, doctors administer local anaesthesia to a part of the
body so that the pain will not be felt by the patient. At which part, do you think, the
nerve impulse is being arrested due to the effect of anaesthesia?
i) at cyton ii) at axon iii) at synapse iv) in the middle of axon

Answer 1

at the synapse
because the drug restrict the transfer of nerve impulse from one neuron to another
and the second reason is,there is a synaptic cleft between the two neurons
hence it gets easier to get into play

Answer 2

The nerve impulse is being arrested at the synapse due to the effect of anesthesia.

Option iii)

Explanation:  

• Doctors subject patients to anesthesia when procedures are to take place and to save the patients from the unpleasant sensation of pain.
• Anesthesia works by blocking the nerve signals to the pain area of the brain, and they achieve this by blocking the otherwise normal conduction between the peripheral nerves.
• At the synapses, this blocking occurs, and due to the presence of the synaptic cleft, this transfer of conduction gets stopped and the sodium channels get deactivated.  

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