What is the main photopigment contained by rods?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What is the main photopigment contained by rods?

Explanation:
Rods use a single photopigment called rhodopsin. Rhodopsin is a complex of the opsin protein bound to 11-cis-retinal, the chromophore. When light hits it, 11-cis-retinal isomerizes to all-trans-retinal, triggering a signaling cascade that enables vision in dim light. This high sensitivity distinguishes rods from cones, whose pigments are photopsins (iodopsin and related cone pigments) that handle color vision in brighter conditions. Retinal by itself is the chromophore component, not the complete photopigment.

Rods use a single photopigment called rhodopsin. Rhodopsin is a complex of the opsin protein bound to 11-cis-retinal, the chromophore. When light hits it, 11-cis-retinal isomerizes to all-trans-retinal, triggering a signaling cascade that enables vision in dim light. This high sensitivity distinguishes rods from cones, whose pigments are photopsins (iodopsin and related cone pigments) that handle color vision in brighter conditions. Retinal by itself is the chromophore component, not the complete photopigment.

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