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biologic clock in humans; the rhythmic repetition of certain phenomena, such as hunger, fatigue, and changes in blood pressure, that tend to fluctuate within a 24-hour period
the snail-shaped tube (in the inner ear coiled around the modiolus) where sound vibrations are converted into nerve impulses by the Organ of Corti
located in semicircular canals--"ear stones" have hair cells that when bent, indicate to body that you're moving-acceleration or deccelaeration
a yellowish central area of the retina that is rich in cones and that mediates clear detailed vision
farsightedness resulting from a reduced ability to focus caused by loss of elasticity of the crystalline lens with age
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