MICROANATOMY

Detailed explanation-1: -Photoreceptors are polarized neurons with a specialized morphology optimized to detect light stimuli. The outer segments of both rods and cones are modified sensory cilia, containing membrane disks organized in a stack.

Detailed explanation-2: -When light hits the photoreceptor, the retinal changes shape, which activates the photopigment rhodoposin. Primates have full color vision because of the three-cone (trichromatic) system; color is a result of the ratio of activity of the three types of cones.

Detailed explanation-3: -A photoreceptor cell is a specialized type of neuroepithelial cell found in the retina that is capable of visual phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes.