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PSYC 2001 (163)
Lecture

receptors.docx

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Department
Psychology
Course
PSYC 2001
Professor
Elizabeth Nisbet
Semester
Fall

Description
Receptors  Stimulus: environmental change of an organism → change in energy  Transduce (→convert) a stimulus into a nerve impulse o Stimulus above threshold o Detected by receptors o Changes its membrane potential o Causes generator potential o Action potential along sensory neurone  Receptors respond to specific stimuli only Pacinian Corpuscles  Found in dermis of skin, joints, tendons, external genitalia, internal organs  Structure o Layers (maellae) of connective tissue surround o Myelinated sensory neurone (nerve fibre ending) that have o Stretch-mediated Na+ channels  Round pacinian corpuscle has a resting potential  Stretch-mediated sodium channels restrict movement of ions  PRESSURE OPENS SODIUM CHANNELS  Entry of sodium ions  Causes depolarisation / membrane potential / generator potential  Threshold potential reached o Slight pressure / small generator potential / no depolarisation o Great pressure / more channels open / larger generator potential The Eye Table 16-8-1:
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