| 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 |
