Summary
Summary Topic 8 Eye and eye development
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Edexcel Biology Topic 8 Eye and eye development,
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The EyeThe Eye converts light energy into electrical energy
.
-
S.I units
conjuctive
&
(
-macula
S
pupil - Blind spot
I liary musche
Correa + Lens =
focus light onto the retina
Vitreous humour :
transparentjelly
Pupil + Iris Antagmistic
2
Radial
&
muscles -
Circular muscles
-
~ CM contract = constriction
-
RM contract = dilate
sm
highlight intensity
- photoreceptors > optic e
nerve
synapse
Sympatetic e
inhibitory synapse (no action potentials)
motor neurones radial muscles relax
=
Parasympathetic +
Stimulatory synapse (action potentials)
motor neurones > circular muscle contracts
-
, Sclera white hard ,
gives eye shape
= ,
Choroid layer blood vessels to
transport oxygen and
+
glucose for aerobic respiration production of ATP
,
S.I units Retinu =
~
Rods and Cones
-
&
'Forea
peripheral
Rods :
* > Furthest point
from light
-
Jotement
() /innement
I1] synaptic region
Bipolar neurone -
ganglion neurones
a optic leave
Outer
retinal
Segment pig
ment rhodopsin formed
-
of
and opsin joined by bond a
Retinal = refina from vitamin A
Inner - lots mitochondria ,
segment of generates ATP
Synaptic a
region
connected to a
bipolar nerve -
generator
potentials
Dark Conditions :
Nutispumped outof theinnerseymenevels facilitated
and via
in he outer
segment
-
> Results Neurotransmitter secreted via exocytosis
in
called glutamate which is an
inhibitory
neurotransmitter
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