01:119:116 Lecture Notes - Lecture 20: Inner Ear, Cyclic Guanosine Monophosphate, Opsin
18 Jun 2020
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Document Summary
Individual gains info from external environment and internal state of body. Neuronal afferent neuron whose axon extends directly into cns. Non-neuronal form chemical synapse with afferent neurons: sense organs. Ex: eyes, ears, nose, taste buds: transduction, convert e of stimulus into electrical e= sensory transduction, receptor potential. Caused by flow of ions across plasma membrane of sensory receptor. Strong stimulus greater depolarization: transduction can be modified in two ways. The larger the receptor potential, the more frequent the aps: perception, brain processes info that reaches it via sensory neurons, exist only in the brain. Ap produced in sensory receptors that detect particular stimulus. Synapse with particular neurons in brain or spinal cord. Brain distinguishes stimuli based on pathway taken by ap: 5 types of sensory receptors, mechanoreceptors. Sense physical deformation caused by stimuli such as pressure, stretch, motion, and sound. Ex. sense of touch= mechanoreceptors that are dendrites of sensory neurons.
