Section 3

Sensory Systems

• The ear converts sound into electrical signals that are interpreted by the brain.

• Photoreceptors in the eyes convert light into electrical signals that are interpreted by the brain.

Vocabulary sense organ (p. 1016) auditory canal (p. 1017) tympanic membrane (p. 1017) Eustachian tube (p. 1017)

cochlea (p. 1G17) semicircular canal (p. 1G1B) retina (p. 1G1B) cornea (p. 1G1B)

• Stimulation of neurons in taste buds is interpreted as taste. Olfactory receptors in the nasal passages transmit signals to the brain, where they are interpreted as odor.

pupil (p. 1G1B) iris (p. 1G1B) lens (p. 1G1B) rod (p. 1G1B)

cone (p. 1018) taste bud (p. 1019) papilla (p. 1019) olfactory receptor (p. 1019)

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