Question

Answer briefly :
How do you perceive the colour of an object?

Answer 1

There are three types of cone cells corresponding to three primary colours of red, green and blue. Cones contain iodopsin. Light induces dissociation of iodopsin into opsin and retenene. Specific changes in opsin set in a reaction involving transducin, cGMP and $N{a}^{+}$ channels. This produces a signal that generates an action potential in the ganglion cells through bipolar cells. The action potential is conducted by the optic nerve fibres to the visual area of the occipital lobe of the cerebral hemisphere where erect image termed is recognized.