01:119:116 Lecture Notes - Lecture 20: Oval Window, Semicircular Canals, Eardrum
15 Mar 2016
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2 types of info: quality (type, quantity. Transduction: convert e of stimulus into electrical e (neural impulse) Sensory transduction: flow of ions across membrane. 100,000x more e than photons that triggered it. Many product molecules produced by single enzyme. Decrease in freq. of ap in sensory neuron. Transmission: info travels as neural impulses, stimulation of receptor. The larger the receptor potential, the more freq. the action potential. Mechanoreceptors: change shape, ex: pressure, stretching, sound, ion channels linked to hairs (cilia extend from cell, alter ion channel permeability. Chemoreceptors: stimulus molecule binds to specific receptor of sensory cell, change in ion permeability, ex: gustation and olfaction. Detect electric fields produced by preys muscle activity: photoreceptors. Hearing sense changes in pressure: mechanoreceptors. Ear: outer ear- pinna and auditory canal, middle ear- auditory bones, inner ear- cochlea (semicircular canals) Pathway: sound waves enter outer ear. Vibrates: vibrations transmitted to middle ear. Transmit vibrations to oval window: vibrations of oval window.
