In the ear, sound waves pass successively through air, bone, and a watery fluid to reach the marvelous organ of Corti, which converts mechanical energy into electrical energy that the brain interprets as sound.The eye is actually a part of the brain itself, and functions as a living camera with automatic control of focus and light. In the retina, light passes through living fiber optics to reach the photoreceptor cells that pass information to the brain, which is interpreted as vision.
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