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neuroscience exam 2 part1
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spatial summation
adding EPSPs from different location
Temporal summation
EPSPs arriving rapidly at same synapse
Postsynaptic neuron intergrates inpunts and output by?
action potential-if voltage reaches threshold
Axon hillock
action potential initaited here, and membrance voltage needs to reach 40mv for action potential firing.
depolarization decrease with
distance in dendrite
when excitory synapse and inhibitory synapse are active then
inward movement of negatively charged chloride ions neutralizes EPSP
hydrophilic head and hydrophobic
water loving,and water
phospholipids
building blocks of cell membrance
Polar (hydrophilic head group)
Choline,phosphate, and glycerol
nonpolar(hydrophobic tail)
2 long hydrocarbon tail
phospholipid bilayer
makes up the core of the cell membrance
Lipid bilayer flexibility
small non-polar molecules, ex o2, co2,n2 and lipid bilayer impermeable to ions
k+
high conc of K+ inside
low conc. of K+ outside
Na+
high conc of Na+ outside
low conc. of Na+ inside
membrance transport proteins
to transport ions +other molecules across membrance
transporters
-bind solute
-conformation change to transfer across membrane
channels
-acqueous pore across bilayer
-don't bind solute
-faster rate of transport compared to transporters
Concentrantion gradient is
DOWN
Passive transport
down concentration gradient
active transport
against concentration gradient requires energy
Diffusion
-ions will not pass through bilayer
-with channels in membrane diffusion will push ions through ion channel b/c concertration gradient
-until even distribution on both sides.
sodium-potassium pump
-moves NA+ and K+ aganist their concentration gradients
-requires ATP
-for every ATP:3 NA+ pumed out and 2K+ pumped in
Author
ankurkum
ID
67533
Card Set
neuroscience exam 2 part1
Description
1
Updated
2011-02-20T00:07:37Z
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