VII.A.2 Different types of sensory systemsPresent Flag illusionSensory 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 SightVisualPhotoreceptorAuditoryHearingTasteGustatoryTaste budSmellOlfactoryOlfactory receptorTouchSomatosensoryE.g. free nerve endingBalanceVestibularHair cellsVibration (fish, frogs)Lateral lineHair cellsElectric (electric fish, platypus)ElectricElectroreceptorsHeat (snakes)Infra RedInfra Red receptorsHair cellsGeneral 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 calledTransductionSensory receptor cells have mechanisms which act either directly or indirectly (through 2ndmessengers) 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