PHYSL212 Study Guide - Thalamus, Lamellar Corpuscle, Lateral Inhibition
13 Dec 2014
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Document Summary
Sensory receptors generate receptor potential in response to stimuli. Strength of the response can vary and may not result in actual action. Receptors react to both appropriate and inappropriate responses and generate appropriate response to it(eg. poked in an eye: touch is inappropriate stumilus, response is a flash of light appropriate). Involve somatic receptors: respond to: temperature, pressure/touch, sense of posture and movement, pain, ability to identify position of own body in space without help of visual senses proprioception. 5 types of receptors: meissener"s corpuscle (rapid, merkle"s corpuscle (slow, free nerve ending (slow, pacinian corpuscles (rapid) - + vibration and deep pressure, ruffini corpuscle (slow) - + skin stretch. Stimulus opens voltage gated na channels in first node of ranvier. Ions flow into the cell changing membrane potential. If stimuli is strong enough to reach a threshold, ap is generated: the strength of stimuli determines how much ap is generated.
