Rods_and_cones.ppt - Rods rods have rhodopsin consisting...

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Rods rods have rhodopsin consisting retinal and opsin (in membrane). Retinal is a form of vitamin A and is hooked to the opsin A photon changes retinal from 11-cis to all trans Retinal changes it shape and leaves opsin. Opsin undergoes conformational changes to metarhodopsin II . Metarhodopsin II is unstable crosses into the intracellular space and turns back to all-trans retinal. A transporter transports the all-trans retinal out of the outer segment into the pigment epithelium. All-trans retinal turns into all-trans retinol which is the precursor for 11 - cis.
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Cones opsin rather than rhodopsin three cone opsins (blue, red and green) cGMP controlled by cGMP phosphodiesterase Activation of pigment molecules lead to the activation of cGMP
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