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13 terms

photoreceptors

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photoreceptors
detect photons, filled with photopigments, they change their conformation when struk by a photon.
types of photoreceptors
rods, cones
rods
detect intensity, black and white vision. only function in dim light.
cones
detect wave lengths, color vision, only function in bright light.
1
photon strikes rhodopsin, breaks down into opsin and retinal. bleaching
rods photopigment
contain photopigment called rhodopsin
rhodopsin subunits
retinal, opsin
2
bleaching of rhodopsin causes the membrane potential of the rod to change
3
rod releases less nt
4
bipolar neuron detects the drop in nt from rod. change in membrane potential of the bipolar neuron. change in amount of nt bipolar neuron releases
5
ganglionic neuron detects the change of nt from bipolar. change in ap frequency on axon. optic nerve.
cones
color receptors. detect different wavelengths of light.
types of cones
blue, green, red. sensitivities overlap patterns of ap on cones detect specific colors.