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-area of your body over which a nerve fiber can detect a stimulus
-big field is low resolution |
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| inhibition of lateral neurons increases perception of stimulus |
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-painful stimulus inhibits inhibitory neuron and goes to CNS
-when you touch it again, inhibitory neuron inhibits so it does not go to CNS |
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-contain most receptors
-odor activates receptors by activating 7-trans membrane protein
-activates G protein
-increases cAMP
-channels open, depolarizes
-neurotransmitters released
-nerve fibers depolarize and send to CNS |
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-sweet-first developed by babies
-umami-detects amino acid glutamate
-taste receptor activation
-increase IP3 and Ca
-activate TRP channels allowing depolarization
-activate voltage gated Ca allowing neurotransmitter release |
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-salt-Na entering
-sour-protons entering channel or blocking K channel |
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-sound enters ear
-basilar membrane vibrates
-hair cells move
-channels open
-cell depolarizes
-neurotransmitters released
-nerve fiber depolarizes
-signal sent to brain |
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-area of sharpest vision
-high density of photoreceptors
-light strikes directly
-high cones |
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-light activates
-decreases cGMP
-channels close and hyperpolarize
-photoreceptors more active in the dark |
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