Sensory receptor function

Summary of Sensory receptor function
Each sensory receptor, whether it be mechanoreceptor, photoreceptor, chemoreceptor, thermoreceptor, or nocireceptor, is responsible for processing an environmental stimulus and converting it to electrical energy. This typically involves opening or closing of an ion channel in the receptor membrane leading to change in receptor potential. The stimulus features that can be encoded can include modality, spatial location, intensity, threshold, and duration of stimulus, which are all important features to assess when interpreting the external environment. 
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Sensory receptor function
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Sensory receptor function

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Tonic receptors, such as Merkel cells, detect stimulus (duration, intensity, both) .