Zoology - Neural Control and Coordination Question with Solution | TestHub

Mechanism of Vision

Light rays (of visible spectrum) are focussed on the retina via passing through the cornea and lens$\to$Light induced dissociation of photosensitive compounds [(photopigments composed of opsin (a protein) and retinal (an aldehyde of vitamin A)] into retinal and opsin$\to$Structural changes in opsin$\to$Changes in membrane permeability$\to$Potentials are generated in photoreceptor cells (rods and cones)$\to$Production of a signal crosses the bipolar cells and reaches the ganglion cells$\to$Generation of action potentials in the ganglion cells$\to$Transmission of these action potentials (impulses) by the optic nerves upto the visual cortex area of the brain for the analysis.