Biol 303 Sensory Mechanics

Biol 303 Sensory Mechanics - Sensory and Motor Mechanics...

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Sensory and Motor Mechanics Sensations – action potentials that reach the brain via sensory neurons Once brain is aware of stimuli, it interprets them, giving the perception of stimuli Sensory reception – detection of stimulus by sensory cells called censory receptors Exteroreceptors – sensory receptors that detect external stimuli Interroeceptros – stimuli coming from within body Functions of Sensory Receptors sensation: converting stimuli (energy) into change in membrane potential which leads to a change in frequency of action potentials sensory transduction, amplicication, transmission, integration Sensory transduction – stimulus into change in membrane potential of sensory receptor Receptor potential – change in membrand potential itself; graded potentials o Opening or closing of ion channels o Occurs when membrane is streched, substances bind, or pigments absorb light Extreme sensitivity; sensitivity changes with conditions Amplification – strengthening of stimulus energy
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Biol 303 Sensory Mechanics - Sensory and Motor Mechanics...

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