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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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Initiation of visual impulse is associated with:
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The correct answer is  When light falls on rhodopsin, it is absorbed by rhodopsin causing isomerization of the retinaldehyde from 11-cis to all-trans form, and a conformational change in opsin. This results in the release of retinaldehyde from the protein, and the initiation of a nerve impulse. The final step is hydrolysis to release all-trans-retinaldehyde and opsin. Ref: Harper's Illustrated Biochemistry, 28th Edition, Page 44