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  -The tough, outermost layer of the eye, indicated by the letter E in the figure, is the ________. -The tough, outermost layer of the eye, indicated by the letter E in the figure, is the ________.

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A chemical can stimulate smell receptors for only a limited amount of time because of a process called sensory ________.

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The posterior chamber of the eyeball is behind the lens and is filled with a very thick, jelly-like fluid called ________ that keeps the retina flat and helps to maintain the shape of the eye.

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One of the smallest bones in the body, the ________ shown at letter B, is shaped like a stirrup.

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The ________, shown at letter G in the figure, controls the size of the pupil.

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Which of these is hearing loss due to the aging process?


A) Meniere's disease
B) Otitis
C) Otosclerosis
D) Presbycusis
E) Acoustic neuroma

F) C) and E)
G) A) and C)

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When the head moves, fluids known as ________ and endolymph in the semicircular canals and vestibule move, activating equilibrium receptors and hearing receptors.

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  -Letter H in the figure indicates the ________, a transparent area on the front of the eye that lets light into the eye. -Letter H in the figure indicates the ________, a transparent area on the front of the eye that lets light into the eye.

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The three tiny bones called ear ossicles are the ________, incus, and stapes.

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Parts of the optic nerve fuse together and cross at an x-shaped structure called the ________, located at the base of the brain.

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The area of the brain that is responsible for interpreting taste sensations is called the _________.

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The gustatory cortex located in the ______ interprets taste sensations.


A) tongue
B) taste buds
C) brain
D) papillae
E) olfactory receptors

F) A) and C)
G) C) and D)

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