16_Sensory - Sensory Mechanisms Home Page 2006: D. Julian...

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1 Sensory Mechanisms © 2006: D. Julian Home Page The senses Sensory organs provide the only channels of communication from the external (and internal) world into the nervous system Receptor cells transduce a stimulus into electrochemical nerve impulses (i.e., APs) Five categories of receptor types: mechanoreceptors, pain receptors, thermoreceptors, chemoreceptors, and electromagnetic receptors. © 2006: D. Julian Sensory receptors in the human skin Campbel and Reece, Fig. 49.3 © 2006: D. Julian
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Mechanoreception: Touch, Movement and Sound © 2006: D. Julian Stretch-sensitive channels (touch receptors) Activated or inactivated by deformation of membrane Na + Cytoskeleton Stretch-sensitive channel Membrane © 2006: D. Julian The lateral line system Fish and aquatic amphibians detect the movement of water around them (used to detect water current, vibrations of prey and predators, pressure waves caused by moving objects, and low frequency sounds). Water moves through a canal and causes bending of cupulae, which is detected by hair cells. © 2006: D. Julian
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This note was uploaded on 04/12/2008 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

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16_Sensory - Sensory Mechanisms Home Page 2006: D. Julian...

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