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biology
the eye
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Subdecks (1)
endocrine
biology > the eye
819 cards
Cards (914)
What is the main focus of today's video?
The
structure
of the eye and
iris
reflex
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What does a cross section of the eye show?
A view of the
inside
of the eye
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What is the first structure light hits when entering the eye?
The
cornea
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Why is the cornea transparent?
To allow all
light
to pass through
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How does the cornea obtain oxygen?
By
diffusion
from the outside air
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What is the function of the cornea?
To
refract
or bend light
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What is the colored part of the eye called?
The
iris
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What does the iris control?
The size of the
pupil
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What is the pupil?
A gap in the middle of the
iris
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What is the role of the lens in the eye?
To
refract
light and focus it
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How does the lens differ from the cornea?
The
lens
can
change
its
shape
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What does the retina contain?
Two types of
receptor cells
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What are cone cells sensitive to?
The
color
of light
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Why can't we see colors in the dark?
Only
rod cells
are active in low light
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What is the fovea?
A spot on the
retina
with
cone cells
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What is the function of the optic nerve?
To transmit
impulses
to the brain
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What happens to the pupil in bright light?
It
constricts
to reduce light intake
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What is the purpose of the iris reflex?
To protect the
retina
from damage
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What are the two types of muscles in the iris?
Circular
and
radial
muscles
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How do circular muscles affect the pupil?
They
contract
to make the pupil
smaller
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What do radial muscles do when it's dark?
They contract to open the
pupil
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What are the steps of the iris reflex in bright and low light conditions?
In bright light:
Circular
muscles
contract
Pupil
constricts
In low light:
Circular muscles relax
Radial muscles contract
Pupil
dilates
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What should you be able to name by the end of the video?
The
different
parts
of the eye
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How do the functions of cone cells and rod cells differ?
Cone cells
:
Sensitive to color
Function well in bright light
Rod cells
:
Sensitive to light intensity
Function well in low light
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What is the function of the eye as a sense organ?
It contains
receptors
sensitive to light
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What is the role of the cornea and lens in focusing light?
Cornea:
Refracts
light to begin
focusing
Lens:
Changes
shape to
fine-tune
focus
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What is the transparent front part of the eye called?
Cornea
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What is the job of the cornea?
To start the focusing of
light rays
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What are the main structures of the eye involved in light processing?
Cornea
Iris
Pupil
Lens
Retina
Fovea
Optic nerve
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Through which part do light rays pass after the cornea?
Pupil
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What is the iris?
The
colored
part of the eye
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What is the function of the lens?
To focus light rays onto the
retina
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What is the process called when the lens changes shape?
Accommodation
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Where are light rays focused in the eye?
On the
retina
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What do the receptor cells in the retina detect?
Light intensity
and
color
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What do receptor cells in the retina send to the brain?
Electrical impulses
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What is the white part of the eye called?
Sclera
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What is the function of the sclera?
To protect the
eye
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What do the ciliary muscles and suspensory ligaments do?
They help focus on
distant
or
near
objects
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What is the space in the center of the iris called?
Pupil
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