When Light of Suitable Wavelength Strikes a Photoreceptor, the Photopigment

Essay

When light of suitable wavelength strikes a photoreceptor, the photopigment (absorbs or reflects) the light, causing the photopigment to (dissociate or regenerate). This photopigment transformation acts through a second messenger system to cause Na⁺ channels in the outer segment to (open or close). Subsequently, the photoreceptor (depolarizes or hyperpolarizes), which results in a(n) (increase or decrease) in release of an (inhibitory or excitatory) transmitter from its synaptic terminal.