Lecture 14 - Somatic and Chemical Senses Bio416K Spring 2010

Lecture 14 - Somatic and Chemical Senses Bio416K Spring...

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General Properties of Sensory Systems (Chapter 10, pages 334-342) STIMULUS Specialized SENSORY RECEPTOR Transducer Graded/receptor potential AFFERENT NEURON Action potential CNS Integration/ Awareness/ Perception Five General Principles of Sensory Systems 1) Specificity – receptors are specialized to respond to specific stimulus (light, temp) 2) Receptive fields – refer to area where physical stimulus activate sensory 3) Transduction – sensory convert physical stimulus to change in membrane potentia ie. depolarization 4) Coding 5) Adaptation Sensory Stimuli (Modalities) – Chemical, Mechanical, Heat, Photons of light Special senses Vision / Hearing / Taste / Smell / Equilibrium Somatic Senses Touch / Temperature / Pain / Itch / Proprioception
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Sensory Receptors – simple or complex Unencapsulated Encapsulated
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Touch, Pressure and Pain Receptors Fine touch * *
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Sensory Receptors – simple or complex
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How can one kind of receptor neuron enable us to discriminate among 10,000 different odors? 1) Mammalian genome contains a family of 1,000 genes encoding different odor binding proteins (G-coupled, c-AMP linked membrane receptor proteins; N = 200-400) 2) Each olfactory neuron expresses only a single type of odor binding protein 3) Each binding protein is capable of binding several different odor molecules (recognize different parts of the odor molecule) 4) Each odor molecule is capable of binding to several different binding proteins
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This note was uploaded on 04/14/2010 for the course BIO Anatomy taught by Professor Findell during the Spring '10 term at University of Texas.

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Lecture 14 - Somatic and Chemical Senses Bio416K Spring...

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