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44 Cards in this Set
- Front
- Back
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The structure that prevents objects from moving behind the eye is the
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conjunctiva.
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The structure responsible for turning light impulses into nervous impulses is the
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retina.
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The layer of the eye responsible for providing nourishment to the eye is the
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choroid layer.
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The eye's shape is maintined by the
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sclera layer and the vitreous humour.
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The cornea is really just a transparent part of the _______ layer.
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sclera (layer).
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Which ligaments hold the lens in place?
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Suspensary ligaments.
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Which structure in the eye is reponsible for regulating the amount of light that enters the eye?
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The iris.
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Specialized receptors found in the retina which respond to differing light intensity but not different wave lengths of light are known as
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rod cells.
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Specialized receptors found in the retina which repond to different wave lengths of light, providing us with colour vision, are known as
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cone cells.
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The macula or fovea centralis is filled with this type of specialized receptor cells.
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Cone cells.
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These receptor cells provide us with good peripheral vision and ok night vision.
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Rod cells.
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To accomodate for a distant object our ciliary muscles will be _____ and our lens _______ to refract light onto our retina.
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relaxed (muscles)
flat (lens) |
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To accomodate for a near object our ciliary muscles will be _____ and our lens _______ to refract light onto our retina.
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contracted(muscles)
round(lens) |
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A person with nearsightedness (myopia)has difficulty seeing objects far away beacuse the lens is focusing objects __________ of the retina.
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in front
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A person with farsightedness(hyperopia)has difficulty seeing objects close up beacuse the lens is focusing objects __________ the retina.
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behind
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Myopia can be fixed by a __________ lens in front of the eye.
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concave (lens)
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Hyperopia can be fixed by a __________ lens in front of the eye.
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convex (lens)
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An uneven curvature of the lense is known as an
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astigmatism.
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A cloudiness in the lens that blocks light from reaching the retina is called a
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cataract.
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Aqueous humor not draining out correctly will cause pressure builds up in the eye and is a condition known as
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glaucoma.
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Severe vitamin A deficiency leads to a lack of rhodopsin, and may impair
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night vision.
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The pinna and auditory canal of the ear help hearing by
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collecting and funneling sound waves.
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The tube that equalizes pressure in the middle ear is the
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eustachian tube.
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The strurcture in the ear that converts sound waves into mechanical vibrations is the
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tympanic membrane.
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The bones in the inner ear that transfer vibrations from the tympaic membrane to the oval window are the
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Ossicles (hammer, anvil and stirrup).
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The ______ window releaves fluid pressure from the vibrations in the lymph of the inner ear.
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round
(Remember, fluid can not be compressed) |
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This organ, found in the inner ear, turns vibrations into nervous impulses.
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The Organ of corti.
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This structure helps give us a sense of balance or head position.
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The vestibule (saccule and utricle)
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These structures help with dynamic equilibrium.
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The semi-cirrcular canals.
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This nerve transmits impulses from the inner ear to the brain.
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The auditory nerve.
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The blind spot is caused by
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the lack of sersory receptors due to the attachment of the ocular nerve.
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This occures when receptor becomes accustomed to a stimulus and no longer sends impulse.
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Sensory adaptation.
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The two primary organs for chemoreception are the
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nose and tongue.
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fovea centralis or the macula.
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The structure labeled 7 is the
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14 (the iris)
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The structure that regulates the amount of light that enters the eye is labeled
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13 (the cornea)
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Cataracts are a clouding of the lens or the structure labeled
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8
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The blind spot is indicated best by this number
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5, the choroid layer.
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In addition to providing the eye with blood flow, this layer in many mammals is shiny to provide better light reception in low light.
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6 the eustachian tube.
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If a child has frequent ear infections, an artificial tube may inserted here to allow drainage. This tube is labeled
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3 (the inner ear)
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The region of the ear that is fluid filled is labeled
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5, the vestibule.
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This area is reponsible for static equalibrium.
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3 the cochlea.
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This area contains the organ of corti.
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9, 10, 11 (the ossicles)
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These structures can help prevent inner ear damage from loud sounds.
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1, the semi-cirrcular canals.
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These structures are responsible for dynamic equalibrium
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