hw # 34 - writing in science (type if you can) due tuesday warm up
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Week 9, Day Three. HW # 34 - Writing in Science (type if you can) Due Tuesday Warm up Name as many parts of the eye as you can. -. Warm up Response. W. Homework Response/Check. Read your neighbor ’ s “ CYFTD ” lab conclusion. - PowerPoint PPT PresentationTRANSCRIPT
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HW # 34- Writing in Science (type if you can) Due Tuesday
Warm up
Name as many parts of the eye as you can.-
Week 9, Day Three
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Warm up Response
W
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Homework Response/CheckRead your neighbor’s “CYFTD” lab conclusion.
Give them some feedback (2 warm and 1 cool).
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•Eyes
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The Human Eye!
Window to the world!
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7 main parts of the eye
Cornea
Iris
Pupil
Lens
Sclera
Retina
Optic Nerve
Pupil
Lens
Iris
Cornea
Retina
Optic Nerve
Sclera
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FYI:Look closely at the eye:
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Sclera
White of the eye
Covers whole outside of eye
Tough protective outer layer
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Cornea
ClearCovers irisAllows light to enterProtectsFocuses Image to help make image clear (ex: coarse adjustment knob)This is where sclera becomes a clear window for the eye
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Iris
Colored part of eye
Muscles open and close pupil
Lighter colored iris lets in more light
Darker colors protect more, less light enters eye
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Pupil
Hole in center of iris
Lets light waves into eye
Adjusts in size to light levels
Light entering shines on retina
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Lens
Behind iris/pupil
Focuses light waves (ex: fine adjustment knob)
Makes images clear
(See next slide for clear picture of lens)
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Check out the eye
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Vitreous Humor
Jelly-like fluid that fills most of the eye (from the lens back)
Helps the eye hold it’s sphere shape
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Retina
Back of the eye where light shinesLike a movie screenShows us what we see by sending information to the optic nerve.
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An Actual Retina!!!
2 kinds of cells in the retina:Cones--see color
Rods--see form and shape
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Tapetum Lucidum
Shiny blue-green color
Reflects lights to allow more light to the retina
Allows for better vision in dark environments
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Optic Nerve
Sends information from the eye to the brain
Thick cord at lower back of eye
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Diagram of the eye:Very dry…
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Can you identify the structures now???
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Facts! Eyes…..
-Are the most complex organs in the body second to the brain.
-Contribute to 80% of your total knowledge
-Are composed of more than 2 million working parts
-During a normal life will bring in 24 million images of the world around you
-The adult eye measures about one inch in diameter (2.5 cm), but only one sixth of the
area is exposed on the front.