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44 Cards in this Set

  • Front
  • Back
The structure that prevents objects from moving behind the eye is the
The structure responsible for turning light impulses into nervous impulses is the
The layer of the eye responsible for providing nourishment to the eye is the
choroid layer.
The eye's shape is maintined by the
sclera layer and the vitreous humour.
The cornea is really just a transparent part of the _______ layer.
sclera (layer).
Which ligaments hold the lens in place?
Suspensary ligaments.
Which structure in the eye is reponsible for regulating the amount of light that enters the eye?
The iris.
Specialized receptors found in the retina which respond to differing light intensity but not different wave lengths of light are known as
rod cells.
Specialized receptors found in the retina which repond to different wave lengths of light, providing us with colour vision, are known as
cone cells.
The macula or fovea centralis is filled with this type of specialized receptor cells.
Cone cells.
These receptor cells provide us with good peripheral vision and ok night vision.
Rod cells.
To accomodate for a distant object our ciliary muscles will be _____ and our lens _______ to refract light onto our retina.
relaxed (muscles)

flat (lens)
To accomodate for a near object our ciliary muscles will be _____ and our lens _______ to refract light onto our retina.

A person with nearsightedness (myopia)has difficulty seeing objects far away beacuse the lens is focusing objects __________ of the retina.
in front
A person with farsightedness(hyperopia)has difficulty seeing objects close up beacuse the lens is focusing objects __________ the retina.
Myopia can be fixed by a __________ lens in front of the eye.
concave (lens)
Hyperopia can be fixed by a __________ lens in front of the eye.
convex (lens)
An uneven curvature of the lense is known as an
A cloudiness in the lens that blocks light from reaching the retina is called a
Aqueous humor not draining out correctly will cause pressure builds up in the eye and is a condition known as
Severe vitamin A deficiency leads to a lack of rhodopsin, and may impair
night vision.
The pinna and auditory canal of the ear help hearing by
collecting and funneling sound waves.
The tube that equalizes pressure in the middle ear is the
eustachian tube.
The strurcture in the ear that converts sound waves into mechanical vibrations is the
tympanic membrane.
The bones in the inner ear that transfer vibrations from the tympaic membrane to the oval window are the
Ossicles (hammer, anvil and stirrup).
The ______ window releaves fluid pressure from the vibrations in the lymph of the inner ear.

(Remember, fluid can not be compressed)
This organ, found in the inner ear, turns vibrations into nervous impulses.
The Organ of corti.
This structure helps give us a sense of balance or head position.
The vestibule (saccule and utricle)
These structures help with dynamic equilibrium.
The semi-cirrcular canals.
This nerve transmits impulses from the inner ear to the brain.
The auditory nerve.
The blind spot is caused by
the lack of sersory receptors due to the attachment of the ocular nerve.
This occures when receptor becomes accustomed to a stimulus and no longer sends impulse.
Sensory adaptation.
The two primary organs for chemoreception are the
nose and tongue.
fovea centralis or the macula.
The structure labeled 7 is the
14 (the iris)
The structure that regulates the amount of light that enters the eye is labeled
13 (the cornea)
Cataracts are a clouding of the lens or the structure labeled
The blind spot is indicated best by this number
5, the choroid layer.
In addition to providing the eye with blood flow, this layer in many mammals is shiny to provide better light reception in low light.
6 the eustachian tube.
If a child has frequent ear infections, an artificial tube may inserted here to allow drainage. This tube is labeled
3 (the inner ear)
The region of the ear that is fluid filled is labeled
5, the vestibule.
This area is reponsible for static equalibrium.
3 the cochlea.
This area contains the organ of corti.
9, 10, 11 (the ossicles)
These structures can help prevent inner ear damage from loud sounds.
1, the semi-cirrcular canals.
These structures are responsible for dynamic equalibrium