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AP Bio senses test


Thin transparent covering of the eye through which light enters. It serves as as a fixed lens that focuses light


concentrates light on a group of photoreceptors


Regulates the size of the light opening (pupil)


Allows light to enter the eye


the light-sensitive membrane covering the back wall of the eyeball


area consisting of a small depression in the retina containing cones and where vision is most acute

Aqueous Humor

the limpid fluid within the eyeball between the cornea and the lens

Vitreous Humor

A thick, gelatinous fluid found in the posterior segment of the eye (between the lens and the retina). The vireous humor is only produced during fetal development and helps maintain intraocular pressure (the pressure inside the eyeball).

suspensory ligaments

a fibrous membrane that holds the lens of the eye in place

ciliary muscles

muscles which relax or contract and alter the shape of the lens


middle layer of tissue in the eye that contains blood vessels that nourish the retina

optic nerve

the nerve that carries neural impulses from the eye to the brain

optic disc

the point where the optic nerve enters the retina. (blind spot)


whitish fibrous membrane (albuginea) that with the cornea forms the outer covering of the eyeball


a coiled bony fluid-filled tube in the inner ear trough which sound waves trigger nerve impulses

tympanic membrane

the membrane in the ear that vibrates to sound (eardrum)

auditory canal

the area that sound waves pass through to reach the eardrum


the external structure of the ear

oval window

fenestra that has the base of the stapes attached to it

Organ of Corti

the hearing organ of the inner ear

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