BSC 2011 Lecture Notes - Lecture 9: Hair Cell, Noxious Stimulus, Nociceptor
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3 Nov 2016
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Interneurons: neurons in the cns (spinal cord or brain) would understand the the signal and send a response to through the efferent neurons. Efferent neurons: from the cns back to the body. Sensory receptor cells transduce stimuli into a change in membrane potential. Leads to an action potential: in the sensory cell itself, or in an associated sensory neuron. Different sensory receptors respond to particular stimuli: mechanoreceptors: pressure sensitive cation channel (inside of cell, thermo-receptors: temperature sensitive cation channel, electroreceptors: voltage-gated ca2+ channel, chemoreceptor: chemical sensitive cation channel, photoreceptor: light sensitive cation channel. These receptors cell only respond if an specific stimuli is present. Brighter light > more photoreceptors responds > photoreceptors fire action potentials more frequently. There is a limit as to how frequent action potentials can be fired regulated by the refractory period needed in between signaling. Adaptation: diminishing response to repeated stimulation (not the same as evolutionary definition)
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