Answer:
Neurons are
called excitable cells because these membranes are in a polarised state.
Different types of
ion channel sare present in the neural membrane, i.e., are selectivelypermeable
to different ions.
When a
neuron is suitably stimulated an electric disturbance is generated, which
swiftlytravels along its plasma membrane.
Arrival of
the disturbance at the neuron's ending or outputzone, triggers events that may
cause stimulation ofadjacent neuron. These are excitable cells due todifferential
concentration gradient of ions (speciallynatural 
)
across the membrane.
The special
features of membrane of neuron are
(i)Excitability
Neurons are able to perceive stimulus and enter a state activity caused by
change in electrical potential difference across its coveringmembrane.
(ii)
Conductivity Change in potential difference, spreadsthrough the membrane to the
whole neuron.
(iii)
Connectivity Neurons are connected to several others, receiving and
transmitting impulses to various directions.
(iv)
Response The processed message may elicit a response in the form of a
sensation.
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