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a visual receptor most sensitive to the violet-purple wave lenghts - very sensitive for night vision, sees only black and white.
chemical receptors on the tongue that decode molecules of food or drink to identify them.
an illusion in which the same object is seen as two alternate figures - first one, the the other.
receptor cells for hearing and sense of smell; found in the cochlea and the nasal cavity.
the firing of the cones not used after viewing something steadily in order to bring the visual system back in balance.
a snail-shaped part of the ear; filled with fluid and small haied that vibrate to incoming sound.
the portion of the retina through which the optic nerve exits and where there are no receptors for light waves.
a colored circular muscle that opens and closes, forming larger and smaller circles to control the amount of light getting into the eye.
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