Cyclic GMP plays a critical role in vision because:

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it is needed to keep Na +  channels open in the outer segment of photoreceptors.

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it is used to transmit information about light from photoreceptor cell to bipolar cell.

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it is needed for the Na + /K +  pump in the photoreceptor inner segment to operate.

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it is the pigment molecule that absorbs light energy in rods.

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it is used to transmit information about light along the indirect pathway to retinal ganglion cells.

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