contains photoreceptors - ______ (function in dim light) and ____ (function in brighter light & used to detect color).
Added by Andrea T.
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The photoreceptors in the retina that are responsible for peripheral vision and vision in dim light are called _____________; those responsible for color vision and for discerning fine details in bright light are called _______________.
Sensation and Perception
Vision: Seeing the Light
are visual receptors that respond to fainter light, while visual receptors that contribute to the perception of color. (1.5 points each)
Andrea Q.
Rods and cones are photoreceptors that function in vision. Rods are responsible for low-light and peripheral vision, while cones are responsible for high-resolution color vision. Rods do not detect color. The structure of photoreceptor rods includes the pigment rhodopsin, which absorbs light and does not distinguish between different wavelengths of light. Rhodopsin is composed of the protein retinal and the pigment derived from vitamin A. In the dark, retinal is in a bent configuration called cis-retinal. The structure of photoreceptor cones includes the pigment photopsin, which responds to specific wavelengths of light. The transduction of light into electrical signals begins when a photon reaches the outer segment of a photoreceptor. In the absence of stimulation (in the dark), photoreceptor cells react by depolarizing and releasing glutamate onto bipolar cells. In the presence of light, photoreceptor cells react by hyperpolarizing and reducing the release of glutamate. Dark and light adaptation allow for adjustments in the sensitivity of photoreceptor cells to different levels of light. Glutamate plays a role in image processing.
Adi S.
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