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)
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  • Spring '10
  • Findell
  • sensory receptor, olfactory receptor, Olfactory receptor neuron, olfactory receptor cells, STIMULUS Specialized SENSORY

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