BI13_Ch15 PP Slides

BI13_Ch15 PP Slides - Special Senses Chapter 15 There are...

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Special Senses Chapter 15
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There are Four Special Senses
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Topics Sense of Vision How eyes detect light How eyes focus Vision disorders Sense of Taste Structure and function of taste buds Taste disorders A taste of research
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Vision Photoreceptors Focusing Disorders
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The Retina Thin layer of nervous tissue Contains 250 million photoreceptors for detecting light Rods Cones
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Rods Function Black and white vision in dim light Shape Photoreceptors with a long, rod-shaped portion of the cell Location Periphery of eye
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Rods Sensitivity Very sensitive Capture blurry images Pigment Rhodopsin Detects green light best
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Cones Function Color vision under bright conditions Shape Cone-shaped cells Location Center of the eye Fovea centralis
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Cones Sensitivity Not very sensitive Require bright light to be active Photopigments: various opsins Red Blue Green
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Photoreceptor Activation Photopigments are made or two molecules Retinal Sensitive to light Changes shape Made from Vitamin A Opsin Determines what wavelength of light is absorbed Hig h Low
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Vision Photoreceptors Focusing Disorders
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Focus on far objects Ciliary muscles
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BI13_Ch15 PP Slides - Special Senses Chapter 15 There are...

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