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Unformatted text preview: circular zone near the edge of the eye. Cones occur in the center (or fovea centralis ) of the retina. Light reaching a photoreceptor causes the breakdown of the chemical rhodopsin , which in turn causes a membrane potential that is transmitted to an action potential. The action potential transfers to synapsed neurons that connect to the optic nerve. The optic nerve connects to the occipital lobe of the brain. Humans have three types of cones, each sensitive to a different color of light: red, blue and green. Opsins are chemicals that bind to cone cells and make those cells sensitive to light of a particular wavelength (or color). Humans have three different form of opsins coded for by three genes on the X chromosome . Defects in one or more of these opsin genes can cause color blindness, usually in males....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10