Prepare fresh solutions for use in Procedure B. Wash your hands before starting the taste experiment.

Use a clean cotton swab for each test. Do not dip a used swab into a test solution.

Dispose of used cotton swabs and paper towels as directed.

Wash your hands before leaving the laboratory.

The senses of smell (olfaction) and taste (gustation) are dependent upon chemoreceptors that are stimulated by various chemicals dissolved in liquids. The receptors of smell are found in the olfactory organs, which are located in the upper parts of the nasal cavity and in a portion of the nasal septum. The receptors of taste occur in the taste buds, which are sensory organs primarily found on the surface of the tongue. Chemicals are considered odorless and tasteless if receptor sites for them are absent.

These senses function closely together, because substances that are tasted often are smelled at the same moment, and they play important roles in the selection of foods.

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