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VertPhys24 - Lecture 24-Know parts of eye-Iris(colored part...

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Lecture 24 - Know parts of eye: -Iris (colored part of eye, muscle), cornea, aqueous humor, posterior chamber, ciliary muscle, zonule fibers, vitreous humor, optic disk, fovea, opticnerve and retinal vessels Pathway: light hits ganglion cell, then bipolar cell, then horizontal cell, then rod/cone Rod: more of these in eye, outer segment is blocklike and more disks.—fxn better in dim illumination -very sensitive; out of corner of eye -low image resolution -peaks at 496 --lots of rods at 40deg eccentricity Cones: color, fewer disks, and triangular in disks (like sail)—fxn better in bright illumination -low sensitivity -good image resolution ---3 types of cones, peak at 419, 531, 559 --lots of cones at 0deg eccentricity (fovea) Blind Spot: in optic disk How do rods/cones work? - Photoreceptors hyperpolarize in response to light. Rods: --how is hyperpolarized receptor potential generated? -results from a decrease in the conductance of the membrane of outer segment to Na+.
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