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Study Guide Week 5

Study Guide Week 5 - TA Victoria Ha Email [email protected]

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TA: Victoria Ha Section: (B03) Monday 5:00-5:50pm Email: [email protected] Office Hours: Thursday Hi Thai 2-3 Study Guide Week 5 Disclaimer: These notes are intended for you to supplement your studies. They are by no means a substitute for going to lecture!! Pages 1101 – 1104 in 8 th edition of textbook Retina : contains photoreceptors. Photoreceptors : specialized neuron found in the eye capable of undergoing phototransduction. Our eyes have two types of photoreceptors: Rods : most sensitive photoreceptor. A single proton can give rise to a response. So sensitive that it can respond to low levels of light but do not distinguish color Enable us to see at night, but only in black and white Rods are not very accurate in vision. This is where cones come in. Rods have a single pigment Cones: photoreceptor that is responsible for color vision. Densely packed in the fovea, but also spread out in the retina. There are no rods in the fovea. That is why you get the sharpest vision by looking directly at an object during the day and the object lands on the fovea. o At night, looking at a dimly lit object is ineffective, because the rods are found outside the fovea. That is why you see a dim star best by not looking directly at the star but to the side of it, so that the image falls off the fovea. Contribute very poorly to night vision There are three different types of proteins that are responsible for three different colors: red, green, and blue People who are color blind have a mutation on the cone. (Usually affects red the most) Mutation is sex linked (thorugh the X chromosome) and affects mostly males. Macula : in the center of the macula is the fovea
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TA: Victoria Ha Section: (B03) Monday 5:00-5:50pm Email: [email protected] Office Hours: Thursday Hi Thai 2-3 Fovea : no rods. Only cones. It just goes directly to photoreceptors and not all the other
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