Lecture 23 Vision - BME 418, Quantitative Cell Biology...

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BME 418, Quantitative Cell Biology Alan J. Hunt Lecture #23: Signal Transduction - Vision, a special case Eye: We won't dwell on the optics. It will suffice to be aware that the lens forms an image on the retina. Note fovia and blind spot where optic nerve attaches. Features of the visual system: - functions well over 5 orders of magnitude (photographic film only 1-2) - time resolution: "flicker-fusion" frequency = 20 Hz - distance from lens to retina is ~ constant, the focal length ( f ) must be varied to form images of objects at different distances (1/ p + 1/ q = 1/ f )
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BME 418, Quantitative Cell Biology Alan J. Hunt Retina: - photoreceptive cells = rods, cones - these form synapses with various cells that carry electrical response passively to ganglionic cells, which then send a actively propagated action potential down the optic nerve - Pigmented epithelium absorbs light, helps isolate photoreceptors (increase resolution). In cat this reflects light to increase sensitivity (two passes through receptor cells). -
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This note was uploaded on 09/06/2008 for the course BIOMEDE 418 taught by Professor Hunt during the Winter '08 term at University of Michigan.

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Lecture 23 Vision - BME 418, Quantitative Cell Biology...

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