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

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Unformatted text preview: orted fire ant Solenopsis invicta http://www.mosquitaire.com/html/img/pool/muecke_big.jpg http://www.utdallas.edu/~pujana/sem/ant2.html 33 Types of Sensory Receptors Mechano Hearing in Invertebrates “Ears”= tympanic membranes stretched over air chamber w/ hairs Tympanal organ in insects varies in location Figure 50.9 (Campbell 9th ed.) 37 Types of Sensory Receptors Mechano Hearing in Vertebrates “Ears”= tympanic membranes stretched over air chamber w/ hairs Cochlea Figure 50.10 and 50.12 (Campbell 9th ed.) 38 Types of Sensory Receptors Mechano Hearing in Vertebrates Organ of corti in cochlea translates vibrations into action potential in auditory nerve Organ of corti Tectorial membrane Hair cells Basilar membrane Understand the form (structure) and function (physiology) of hearing in vertebrates Figures 50.10 to 50.12 (Campbell 9th ed.) 39 Types of Sensory Receptors Mechano Hearing in Vertebrates Ear conveys volume (amplitude) and pitch (frequency) • Basilar membrane varies in width and thickness; • Different portions respond to different frequencies (pitch) • High frequencies vibrate portion closest to oval window • The louder the sound (volume) the faster a portion vibrates http://www.sumanasinc.com/webcontent/animations/content/soundtransduction.html Figure 50.12 (Campbell 9th ed.) 45 Types of Sensory Receptors Chemo Respond to : - individual kinds of molecules - solute concentration of solution 46 Types of Sensory Receptors Chemo Gustation (Taste) & Olfaction (smell) Governed by binding of molecules (oderants or tastants) On hairs on feet and mouthparts (taste) and antennae (smell) In nose and on tongue 47 Types of Sensory Receptors Taste Chemo • In mammals, taste buds are a group of modified epithelial cells w/ receptor proteins. • Each cell signals 1 of 5 (?) tastes: ‐ Sweet Similar ‐ Umami (glutamates) receptor type ‐ Bitter (many types) Capsacin-like ‐ Sour receptor ‐ Salty ‐ fat? ‐ metallic? • All taste buds have cells sensitive to each of the 5 tastes. Figure 50.24 (Campbell 9th ed.) 48 Types of Sensory Receptors Chemo Smell - In mammals, olfaction cells are specialized neurons. • Odorants bind to specific receptors triggering action potentials • Humans: ~ 40 million olfactory receptors that detect ~10,000 different odors • R...
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