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14 Sensory physiology

14 Sensory physiology - Biology141(Physiology 1:03 AM...

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4/6/08 1:03 AM Biology141 (Physiology) Page 1 of 3 https://courses.bio.psu.edu/spring2008/biol141/Lecture%2014(2008).htm Biology141 (Physiology) Lecture 14 M. Whim SENSORY PHYSIOLOGY. [1]. INTRODUCTION TO SENSORY PHYSIOLOGY. our understanding of the world is determined by the types of sensory receptors we have. these receptors convert energy of different sorts (light etc) into electrical signals. what broad categories of stimuli can we sense? [2]. HOW DO RECEPTORS RESPOND TO A STIMULUS? a sensory neuron is activated by its “adequate stimulus”. the adequate stimulus a receptor (generator) potential in the sensory endings. how is the generator potential similar to an excitatory post-synaptic potential? (lecture #13). if the generator potential reaches the threshold membrane potential it evokes an action potential. depending upon the stimulus and the receptor, the cell will fire AP’s briefly or in a sustained manner: What is a tonic sensory receptor?
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