ch10 homeostasis - eye Flashcards
where in eye does conjunctiva encompass
1 layer, covering whole white color part, eye
optic nerve has sensory or motor neurone?
both
i.e.
sensory neurone in the optic nerve
label all parts of front view (eye)
https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0
page 27
https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0 page 28
label all parts of horizontal longitudal section (eye)
https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0 Page 29
https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0
page 30
eyelid struct
- folds, skin
- covers eye
- when closed
eyelashes struct
row
hair lining eyelid
tear gland struct
glandular cells located
upper corner
eye ball
conjuctiva struct
- thin, transparent mucous membrane
- covering sclera in
- exposed front, eyeball
sclera struct
white, opaque, fibrous
eyeball outer layer
continuous with
cornea
sclera
fiborous -> all tough stuff are
opaque -> thats why those that are blind, eye is all white. Only black part can see, coz white part is opaque.
Cornea covers + continuous w/ eyeball
Conjunctiva covers only sclera
cornea struct
transparent outer layer of eyeball
- continuous w/ sclera
- cornea covers iris, pupil, aqueous chamber
iris struct
muscular structure, contains:
2 sets antagonistic muscles
- circular, radial muscles
aqueous chamber struct
space between cornea,
lens
- filled w/ aqueous humor
aqueous haha
what a design.
hahaha.
lens struct
BENTO
Biconvex
Elastic
(None)
Transparent
Ovoid
suspensory ligament struct
fibrous connective tissue
cillary body struct
contain ciliary muscles
cillary body is not cillary muscles.
it CONTAINS
retina struct
innermost layer eyeball
contains photoreceptors
fovea struct
small yellow depression in retina
- greatest conc. cones
- no rods
blind spot struct
area of retina
- optic nerve leave eye
optic nerve struct
cranial nerve
- contain neurons
cranial nerve near brain head neck e.g. but for olvls sake, if ask nerve impulse transmission unless special nerves like optic PLS do not write cranial write sensory/motor/relay
optic nerve contain neurons.
choroid struct
middle layer eyeball
- pigement black high vascularised
Vascularised -> a lot blood vessels
vitreous chamber struct
space behind lens
surround by retina
filled w/ vitreous humor
why does a damn folds of skin covering eye have 3 functions
eyelid funct
protect cornea from dmg
prevent excessive light enter eye
blink, spread tears over cornea
row hairs lining eyelid
funct
shield eye
dust particle
tear gland funct
secrete tears
wash dust particles
lubricate conjunctiva
reduce friction (eyelid movement)
conjunctiva funct
secrete mucus
keep exposed front eyeball
moist
sclera funct
protect eyeball
mechanical dmg
cornea funct
refracts light into pupil
- accounts for most
- refraction of light in eye
iris funct
controls amount light entering
eye
pupil funct
allows light enter eye
aqueous chamber funct
filled w/
aqueous humor
- transparent, watery fluid
- keep front of eyeball firm
- refract light into pupil
lens funct
refract light -> retina
suspensory ligament funct
attaches edge, lens ->
ciliary body
cillary body/muscles funct
recap:
cillary body contain cillary muscles
control lens’
- thickness
- curvature
allow accomodation
retina funct
photoreceptors, retina
- detect light, stimulated
- generate nerve impulses, transmit thru sensory neurons in optic nerve 2 brain
CNS automatically brain, coz its above neck
Optic Nerve is part of Cranial Nerves
fovea funct
enables detailed
colour vision in bright light
cones
photoreceptors
enable color vision
blind spot funct
dosen’t contain any photoreceptors
insensitive 2 light
optic nerve funct
SENSORY NEURONES IN ~
transmit nerve impulse -> brain
when photoreceptor in Retina stimulated
CNS is automatically brain coz its above neck
also part of Cranial Nerves
choroid funct
- prevents internal reflection, light
- contains blood vessels, transport oxygen, nutrients -> eyeball, remove metabolic waste
vitreous chamber funct
contain
vitreous humor
- transparent, jelly like substance
- keep eyeball firm
- refract light -> retina
cousin of cytoplasm
Fill in Blanks (Pupil Reflex)
Photoreceptors in the retina of the eye ___, generate nerve impulses
detect
increased/decreased
light intensity
Fill in blanks (Pupil Reflex)
Nerve impulses pass across another synapse -> motor neuron (transmits
nerve impulses from brain)…
-> effector muscles in iris via optic nerve
iris circular muscles contract,
radial muscles relax,
cause pupil constrict/dilate
decrease/increase amt light entering eye
define accomodation
adjustment -> curvature of lens
clear images objects, different distances,
form on retina
Fill in blanks (Accomodation)
___ photoreceptors in retina, generate nerve impulses
blur image stimulates
Fill in blanks (Accomodation)
The motor neuron transmits nerve impulses from the brain ___
via optic nerve -> effector ciliary muscles, eye
Fill in blanks (Accomodation)
C__ M__ (Distant Object)
Cillary Muscles
Relaxes
Fill in blanks (Accomodation)
C__ M__ (Near Object)
Cillary Muscles
Contracts
Fill in blanks (Accomodation)
S__ L__ (Distant Object)
Suspensory Ligament
Taut
Fill in blanks (Accomodation)
S__ L__ (Near Object)
Suspensory Ligament
Slackened
Thickness, Shape, Focal Length
Fill in blanks (Accomodation)
L___ (Distant Object)
Lens
- Thinner
- Less convex
- Increase focal length
Fill in blanks (Accomodation)
L___ (Near Object)
Lens
- Thicker
- More convex
- Decrease focal length
Fill in the blanks (Accomodation)
Light rays (Distant Object)
Parellel Light Rays
focused sharply, retina
End goal of light rays = Sharp focus on retina = Clear image
Fill in the blanks (Accomodation)
Light rays (Near Object)
Diverging Light Rays
focused sharply, retina
End goal of light rays = Sharp focus on retina = Clear image
