Mention the receptors for light and sound in animals.

Animals receive a variety of external information through specialized structures called sense organs or receptors. These are:
(i) Photoreceptors: They receive light.
(ii) Phonoreceptors: They receive sound.

(i) Ends of dendrites acquire information.
(ii) Through cell body (cyton) to axon and along axon to axon ends information travels in the form of electric impulse.
(iii) The electrical impulse is converted into a chemical signal at the synapse.

$\left[\begin{array}{c}Denrite\end{array}\right]\stackrel{ }{\to }\left[Cyton\right]\stackrel{ }{\to }\left[\begin{array}{c}Axon\end{array}\right]\stackrel{ }{\to } \left[\begin{array}{c}End Point of Newron\end{array}\right]$