sens1_presenta

sens1_presenta - General Properties of Sensory Systems...

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VII.A.2 Different types of sensory systems Present Flag illusion Sensory systems are those parts of the nervous system which give an organism information about the external world and the organism’s internal state. In this course we will not talk about visceroreceptors which give us information about blood pressure, blood pH, etc. NPB 101 talks about these sorts of sensory systems extensively. Sense Name of system Type of Receptor Sight Visual Photoreceptor Auditory Hearing Taste Gustatory Taste bud Smell Olfactory Olfactory receptor Touch Somatosensory E.g. free nerve ending Balance Vestibular Hair cells Vibration (fish, frogs) Lateral line Hair cells Electric (electric fish, platypus) Electric Electroreceptors Heat (snakes) Infra Red Infra Red receptors Hair cells General Properties of Sensory Systems Modules
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As a first step in the perception of a stimulus, signals from the environment must be transformed into neuronal activity. This process is called Transduction Sensory receptor cells have mechanisms which act either directly or indirectly (through 2 nd messengers) to either open or close ion channels. What is the general effect of either opening or closing ion channels? VII.A.3 Sensory transduction and receptor potentials
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As a first step in the perception of a stimulus, signals from the environment must be transformed into neuronal activity. This process is called Transduction Sensory receptor cells have mechanisms which act either directly or indirectly (through 2 nd messengers) to either open or close ion channels. What is the general effect of either opening or closing ion channels? Receptor potentials are very similar to post-synaptic potentials. How are they generated? Change in voltage Open or close channels VII.A.3 Sensory transduction and receptor potentials The larger the magnitude of the stimulus the larger the magnitude of the receptor potential. This is different than action potentials which encode stronger stimuli by increasing firing
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This note was uploaded on 12/10/2008 for the course NPB 100 taught by Professor Chapman during the Fall '08 term at UC Davis.

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sens1_presenta - General Properties of Sensory Systems...

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