41-6 Tools A B photoreceptors receptors in the eye that convert light energy into nerve impulses cornea transparaent layer of eye though which light from an object passes iris a ring of muscle that can expand or contract to change the amount of light that enters the eye pupil open space in the middle of the iris retina the part of the eyeball that contains all the photoreceptors rods photoreceptors that can function in dim light but can't detect color cones photoreceptors that can detect colors but require bright light mechanoreceptors receptor cells for hearing that convert mechanical energy into nerve impulses three tiny bones in the ear that vibrations in the eardrum move the hammer, the anvil, the stirrup the cochlea the organ of the inner ear that contains the mechanoreceptors for hearing. converts vibrations into nerve impulses balance when your body moves, mechanoreceptors detect the direction in which the fluid is moving. your brain uses this info to maintain balance chemoreceptors receptors that respond to specific kinds of chemicals taste buds the chemoreceptors that detect taste are contained in these. located on the tongue how do smell receptors work? they are located on the mucous membrane in the upper cavity of the nose. are stimulated by odor molecules that enter the nose thermoreceptors respond to heat energy nociceptors pain receptors that are located in the skin and most tissues in the body does the brain have any pain receptors? no