Why are neurons called excitable cells? Mention the special features of the membrane of the neuron



Nerve cells are called excitable cells because the potential difference across their membrane changes when they receive the stimulus and a wave of depolarisation or impulse passes from one end to the other.
Special features of membrane of neuron are
(i) They have ${{Na}^{+}}$ - ${{K}^{+}}$ pump which is active during the resting stage.
(ii) Voltage gated ${{Na}^{+}}$ and ${{K}^{+}}$ channels. ${{Na}^{+}}$ channels are densely clustered in the area called trigger zone, where stimulus is normally received.