Question

In the chemistry of vision in mammals, the photosensitive substance is called

(a) rhodopsin

(b) melanin

(c) sclerotin

(d) retinol.

Answer 1

(a) rhodopsin

Photosensitive meaning sensitive to light. The rod cells of retina include a purplish pigment known as rhodopsin. They function in dim light and at night. Rhodopsin includes a protein component, opsin, connected to a nonprotein chromophore, retinal (or retinene), a derivative of diet A, mild falling at the rod is absorbed through the retinal, which changes its shape and separates from the opsin element.

This initiates the transmission of a nerve impulse to the brain. Retinol is the every other call of diet A. Deficiency of this influences the eyes, inflicting night blindness and xerophthalmia. Melanin is a pigment that gives color to the eyes, pores and skin and hair in vertebrates