Case 28: A lady with failing eye sight

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Put the order of transduction into the correct steps.

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phosphodiesterase hydrolyses cGMP causing Na and Ca channels to close, while K channels remain open

Light hits retina and the altered rhodopsin/photopsin molecule activates transducin allowing GDP to be exchanged for GTP

phosphodiesterse is activated

cone/rod hyperpolarises releasing less neurotransmitter


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