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