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Function of the retina Annika Malmgren, 2009
FUNCTION OF THE RETINA To convertelectromagneticwavesinto action potentials AND To differentiatebetween different electromagnetic stimuli
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 OPSIN SCOTOPSIN PHOTOPSIN 445 nm 535 nm 570 nm Blue Green Red
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 RETINA To convertelectromagneticwavesinto action potentials AND To differentiatebetween different electromagnetic stimuli (bothcolors and static/movement)