Tubulin dimers in which the β-subunit has bound GTP are added preferentially to (+) end of the microtubule.

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Inputs from eye to CNS: 

Input from the rods 

Input from the cones

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#Unit 7. System Physiology – Animal

Duplicity Theory 

The existence of these two kinds of input, each working maximally under different conditions of illumination

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#Unit 7. System Physiology – Animal

Axons of retinal ganglion cells  Received and transduced information and carried to the CNS

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Blind spot  There are no visual receptors over the optic disk

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The photosensitive pigment in the rods is called rhodopsin (visual purple).

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Rhodopsin is comprised of: 

Retinal (an aldehyde of vitamin A)

Opsin protein (GPCR)