Ch 50 - Sensory and Motor Mechanisms (1 slide per page)

173 campbell 9th ed 62 retinalrods pigmentretinalopsin

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Unformatted text preview: rods 6 mil cones C R Each contains pigments consisting of 2 bonded components: • Retinal = light absorbing molecule (derived from vitamin A) • Opsin = a protein • Different opsins result in different pigments Figure 50.17(3) (Campbell 9th ed.) 62 Retinal Rods Pigment: Retinal + opsin = Rhodopsin Light causes conformational change in Rhodopsin, inducing action potential in cell body and then optic nerve Figure 50.17 (4)(Campbell 9th ed.) Retinal Cones 63 Pigment: Retinal + opsin = photopsin 3 different photopsins (w/ dif opsins) detect different wave lengths Red Magenta Yellow White Green Cyan Blue Color blindness due to either: • Defective opsins • Lesions of visual cortex concerned with color vision 65 Types of Sensory Receptors Thermo Respond to: ‐ changes in temperature ‐ dif receptors for dif temp ranges ‐ capscaisin activates high temp receptor ‐ menthol (in mint) activates low temp receptor 66 Types of Sensory Receptors Pain naked dendrites in the epidermis Respond to: ‐ excess heat or pressure, ‐ chemicals released from damaged tissues e.g. prostaglandins from inflammatory response (aspirin/ ibuprofen inhibit prostaglandin synthesis) th Figure 50.5 (Campbell 99th ed.) Figure 50.5 (Campbell ed.) 67 Skip: Ch 50 study guide Figure 50.2 (1086) Statocysts/statoliths and Figure 50.8 (top) (1090) Equilibrium and Figure 50.13 (1093-1094) Sensory transduction and Figure 50.18 (1098) Processing in Retina and Figure 50.19 (1098-1099) Processing in brain and Figure 50.20 (1099) Figure 50.23 (1102) Concept 50.6 (1110-1115) 68 NEXT • Chapter 35 – Plant Structure, Growth & Development...
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