E2’s ion binding sites are exposed to the exterior of the cell and it has low affinity for Na+ but high affinity for K+

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

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#Unit 7. System Physiology – Animal

Blind spot  There are no visual receptors over the optic disk

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#Unit 7. System Physiology – Animal

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

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#Unit 7. System Physiology – Animal

Rhodopsin is comprised of: 

Retinal (an aldehyde of vitamin A)

Opsin protein (GPCR)

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Retinal is parallel to the surface of the membrane and is attached to a lysine residue at position 296 in the seventh TM domain.

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#Unit 7. System Physiology – Animal