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22 Cards in this Set
- Front
- Back
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Spatial summation
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impulses from several neurons at the same time
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Metabotropic receptor
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doesnt have a pore through which ions flow, but does have a binding site for NT. With an ion channel: binds, activates G protein, alpha sub of G binds to channel, and opens it. With enzyme: NT binds, activates G protein, alpha sub of G binds with enzyme and activates 2nd messenger which activates other cell processes.
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Excitatory
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Depolarization
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Setotonergic system
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Increases-obsessive compulsive disorder, schizo
Dcreases-depression |
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Inhibitory
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Hyperpolarization
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Difference betw exogenous and endogenous
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Exogenous is synthetic, endogenous is made by brain
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Action Potential
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signaling unit, long distance signaling, massive depolarization (where inside+ and out -). Only initiated at axon hillock.
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3 things hormones are impt for
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homeostasis, stress, reproduction
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Graded potentials
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small changes in voltage across membrane, proportional to intensity of stim, decay as move away from site of stim
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Ionotriopic receptor
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Allows the movement of ions across a membrane. It has a binding site for NTs and a pore or channel. Bring about very rapid changes in voltage.
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What is a major difference betw action and graded potential?
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If a stim stopped in graded, the graded stops. If stim stopped in action and reaches potential, still goes thru events.
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Difference betw Neural and hormonal commun?
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Neural is fixed like a phone, and fast; hormonal is like a broadcast and slower
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What happens to the postsynaptic neurons after EPSPs and IPSPs?
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Both produce normal APs but the EPSP causes a depolarization in the post and the IPSP shows a hyperpolarization in the post.
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Vasopressin
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H20 retention, blood pressure
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hierarchy in control of hormones
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Brain--Pituitary---Gland--Target Tissue
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Hyperthyroidism
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When not enough iodine, TRH keeps releasing and creates goiter, and possible cretinism
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Nonadrenergenic system
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Emotional tone,
Decreases in norepinephrine=depression Increases=mania |
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Tropic
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stimulating hormones
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ACh
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First to degen in Alzheimers, NT, used by motorneurons to make muscles work
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Dopaminergenic system
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Loss of dopamine-parkinsons,
too much dopamine--schizo |
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Acromegaly
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Hyperpit--giantism, enlarge of bones GH grwth hormones
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Oxytocin
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reprod/parental bhv
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