BIPN100 Sheet 4 answersss

BIPN100 Sheet 4 answersss - H andout 4 I. Sensory Receptors...

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Handout 4 I. Sensory Receptors a. Mechanoreceptors -respond to mechanical stimulus i. Example-touch receptors in skin 1. Hair on arm-blow softly on arm, feel sensation b/c receptors at base. When hair moves, stimulates receptors ii. Also in muscles-responds to stretch b. Chemoreceptors -respond to chemical ligands that bind c. Photoreceptors -for vision and respond to light (photons) d. Thermoreceptors -respond to temperature II. Tonic vs. phasic receptors a. Phasic -FAST adapting i. Example- olfactory receptors, smelling in bathroom b. Tonic -SLOW adapting i. Proprioceptors ii. Baroreceptors (blood pressure) iii. chemo receptors (sensitive to pH or CSF or [O2] or [CO2] Continuously monitored. Do not desensitized because would stop receiving important stimuli. III. Sensory Coding a. Graded potential (also called generator potential if results in AP) train of AP’s NT release. b. Longer stimulus more train of APs more NTs c. Tonic and phasic receptors i. Phasic-on response, stops responding, and off response
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This note was uploaded on 03/31/2010 for the course BIMM bimm 100 taught by Professor Dr.sato during the Winter '08 term at UCSD.

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BIPN100 Sheet 4 answersss - H andout 4 I. Sensory Receptors...

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