Many photoreceptors based on interaction of two molecules:

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Presentation transcript:

Many photoreceptors based on interaction of two molecules: ECF ICF photoreceptor membrane opsin

trans-retinal 11-cis-retinal

11-cis-retinal binds to opsin to form rhodopsin

light rhodopsin 11-cis metarhodopsin trans opsin alters PNa trans-retinal alters PNa

trans retinal rhodopsin

Compound Eyes Present in Insects and Horseshoe Crab Composed of multiple units called “ommatidia” Image-forming eyes Visual acuity less than for vertebrate eye

Limulus Ommatidium lens Light r.c. Retinular cell Eccentric axon e.c.

Lateral Inhibition B A record from A record from B

Insect Compound Eye

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