lecture 24--the eye & retina

lecture 24--the eye & retina - Differences between...

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Differences between rods and cones Rods: sensitive--work in low light levels; large diameter to capture as much light as possible; poor image resolution; many rods/ ganglion cell; high density in retinal periphery; low density in fovea (you see better at night by looking “out of the corner of your eye”; single photopigment (no color vision). Cones: insensitive--work in high light levels; small diameter to get good image resolution; single cone/ganglion cell in fovea; high density in fovea; low density elsewhere; 3 photopigments (color vision).
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light light
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Blind spot- region where there Photoreceptors are NOT present
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cGMP 5’GMP Ligand that binds to Na+ channels Does NOT bind to Na+ channels
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Light One rhodopsin molecule absorbs one photon 500 transducin molecules are excited 100,000 cyclic GMP molecules are hydrolyzed One million Na ions per second are prevented from entering the cell 500 phosphodiesterase molecules are excited 250 Na channels close +
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Rhodopsin + light Activated Rhodopsin Rhodopsin kinase Activated
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This note was uploaded on 07/31/2009 for the course BIO 365R taught by Professor Draper during the Spring '08 term at University of Texas at Austin.

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lecture 24--the eye & retina - Differences between...

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