BIOL164Ch9NotesWin12

BIOL164Ch9NotesWin12 - Ch. 9 Sensory Systems Sensation =...

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1 Ch. 9 – Sensory Systems Sensation = information about environmental conditions (inside or outside of the body) is detected and sent to the CNS –Vs . perception = when sensation reaches conscious awareness (only ~ 1% of all sensations are perceived!) The steps of sensation and perception
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2 Sensory receptors Sensory receptors = structures that detect stimuli (= changes) in the conditions of both the inside and the outside of the body and send that info to the CNS in the form of action potentials (which is the “language” of the NS) – Sensory receptors are specialized to detect different kinds of stimuli; e.g., light, sound, pressure, chemicals, temperature, etc. (see the next slide for the general types of sensory receptors) • In each case, the trick is for the stimulus to trigger the opening or closing of gated sodium channels Ultimately, though, what you sense (and perceive) depends on where in the brain the info is sent to Sensory adaptation occurs when sensory receptors slow or stop responding when they are constantly stimulated • This is a.k.a. “getting used to” a stimulus • Most sensory receptors respond maximally to changes in stimulus
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This note was uploaded on 03/12/2012 for the course BIOL 164 taught by Professor Tonychennault during the Winter '12 term at Clark College.

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BIOL164Ch9NotesWin12 - Ch. 9 Sensory Systems Sensation =...

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