89 Structure And Function Of The Eye Rods And Cones Biology Notes For Igcse 2014 2024 The iris muscles work together to regulate the amount of light entering the eye. the iris contains circular muscles and radial muscles. the circular muscles form circles around the pupil. the radial muscles radiate outwards from the pupil. the circular and radial muscles of the iris are antagonistic, meaning that they work against each other. Rods and cones are light sensitive cells in the retina. when stimulated they generate electrical impulses, which pass to the brain along the optic nerve. the normal retina has rods that see only black, white, and shades of grey and tones and three forms of color cones, red, green, and blue. function. distribution.
89 Structure And Function Of The Eye Rods And Cones Biology Notes For Igcse 2014 Rods and cones are light sensitive cells in the retina. when stimulated they generate electrical impulses, which pass to the brain along the optic nerve. the normal retina has rods that see only black, white, and shades of grey and tones and three forms of color cones, red, green, and blue. more photo of rods and cones. The human eye: structure. the eye is a highly specialised sense organ containing receptor cells that allow us to detect the stimulus of light. the retina of the eye contains two types of receptor cells: receptor cells that are sensitive to light, known as rods, and receptor cells that can detect colour, known as cones. Coloured ring of circular and radial muscle that controls the size of the pupil. lens. transparent, convex, jelly like structure. refracts light to focus it onto the retina. retina. light sensitive layer made up of rods and cones. rods (retina) detect light of low intensity. cones (retina). Produce tears which cleanse and lubricate the eye. sclera (1) tough, outer layer; "white of the eye"; helps maintain shape of the eye, extrinsic muscles that move the eye are attached to the sclera. choroid (2) vascular middle layer; nourishes outer layers of the retina through the blood vessels, vascular = blood supply. nourishes = oxygen.
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