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Chamberlain University-Illinois
BIOS 252
BIOS252 Exam 3 Questions and Answers
2026 Latest Update
Anatomy of the ear Ans: Outer ear:
-Tympanic membrane
-Auricle
-Auditory canal
Middle ear:
-Ossicles: Malleus, Stapes, Incus
-Auditory tube
Inner Ear:
Semicircular ducts
Vestibular nerve
Cochlear nerve
Cochlea
Vestibule
utricle and saccule function Ans: responsible for static equilibrium and the
sense of linear acceleration
Utricle: forward or backward linear movement
Saccule: senses linear movement up and down
external auditory canal function Ans: -passage leading through temporal
bone to tympanic membrane
© 2026 All rights reserved
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-Produces Cerumen (earwax): blocks foreign particles, waterproofs, and keep
tympanic membrane pliable
cochlea function Ans: hearing
semicircular canals function Ans: dynamic equilibrium (determining rotary
motion of the head)
Eye Anatomy Ans: Tunica fibrosa: outer
Sclera: dense, collagenous white of the eye
Cornea: transparent region of modified sclera in front of eye
Tunica vasculosa: middle
Choroid: Highly vascular, pigmented layer behind retina
Ciliary body: extension of choroid; muscular ring around lens, Supports lens
and iris, Secretes aqueous humor
Iris: color diaphragm controlling size of pupil
Lens: Changes shape to help focus light
Pupil: The hole located in the iris that changes size to allow different
amounts of light into the inner eye.
Tunica interna:
Retina: detection of light
Describe the Cornea Ans: -transparent region of modified sclera in front of
eye
-refracts light more than lens does
-Light passing through center of the cornea is not bent
Describe the macula Ans: -patch of hair cells and supporting cells in the
saccule and utricle
-Macula sacculi: lies vertically on wall of saccule
-Macula utriculi: lies horizontally on floor of utricle
© 2026 All rights reserved
Chamberlain University-Illinois
BIOS 252
BIOS252 Exam 3 Questions and Answers
2026 Latest Update
Anatomy of the ear Ans: Outer ear:
-Tympanic membrane
-Auricle
-Auditory canal
Middle ear:
-Ossicles: Malleus, Stapes, Incus
-Auditory tube
Inner Ear:
Semicircular ducts
Vestibular nerve
Cochlear nerve
Cochlea
Vestibule
utricle and saccule function Ans: responsible for static equilibrium and the
sense of linear acceleration
Utricle: forward or backward linear movement
Saccule: senses linear movement up and down
external auditory canal function Ans: -passage leading through temporal
bone to tympanic membrane
© 2026 All rights reserved
, 2 | Page
-Produces Cerumen (earwax): blocks foreign particles, waterproofs, and keep
tympanic membrane pliable
cochlea function Ans: hearing
semicircular canals function Ans: dynamic equilibrium (determining rotary
motion of the head)
Eye Anatomy Ans: Tunica fibrosa: outer
Sclera: dense, collagenous white of the eye
Cornea: transparent region of modified sclera in front of eye
Tunica vasculosa: middle
Choroid: Highly vascular, pigmented layer behind retina
Ciliary body: extension of choroid; muscular ring around lens, Supports lens
and iris, Secretes aqueous humor
Iris: color diaphragm controlling size of pupil
Lens: Changes shape to help focus light
Pupil: The hole located in the iris that changes size to allow different
amounts of light into the inner eye.
Tunica interna:
Retina: detection of light
Describe the Cornea Ans: -transparent region of modified sclera in front of
eye
-refracts light more than lens does
-Light passing through center of the cornea is not bent
Describe the macula Ans: -patch of hair cells and supporting cells in the
saccule and utricle
-Macula sacculi: lies vertically on wall of saccule
-Macula utriculi: lies horizontally on floor of utricle
© 2026 All rights reserved
