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Function of the retina. Annika Malmgren, 2009. FUNCTION OF THE RETINA. To convert electromagnetic waves into action potentials AND To differentiate between different electromagnetic stimuli . structure of the retina. The fovea. Photoreceptors. Photoreception. BATHORHODOPSIN.

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Function of the retina

Function of the retina

Annika Malmgren, 2009


Function of the retina1
FUNCTION OF THE RETINA

To convertelectromagneticwavesinto action potentials

AND

To differentiatebetween different electromagnetic stimuli


Structure of the retina
structure of the retina


The fovea
The fovea



Photoreception
Photoreception

BATHORHODOPSIN

RHODOPSIN

METARHODOPSIN II

Opsin

All-trans

Water

Transducin

Retinaldehyde

11-cis

Alpha-subunit

5’-GMP

cGMP

Phosphodiesterase

Na+

LIGHT

HYPERPOLARIZATION

K+

Na+


Opsins
opsins

OPSIN

SCOTOPSIN

PHOTOPSIN

445 nm 535 nm 570 nm

Blue Green Red


Signal transmission
Signal transmission

Glutamate

Glutamate

(inhibiting)

OFF cells

ON cells

Inhibition

Excitation

W-cellsX-cellsY-cells

From rods From cones: From cones:

Color, shape Movement


Function of the retina2
FUNCTION OF THE RETINA

To convertelectromagneticwavesinto action potentials

AND

To differentiatebetween different electromagnetic stimuli

(bothcolors and static/movement)


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