determined by size, shape, distribution of
charge - ....ANSWER >>>>ungated Ion
Channels
,-volgate (e.g.) Voltage dependent Na+
channels)
-Chemically (e.g. Nicotinic AcH receptor
channels) - ....ANSWER >>>>Gated Ion
Channels
Conductance depends on probability that
channel is open. - ....ANSWER >>>>Ion
Channels
the diffusion potential that exactly balances
or opposes the tendency for diffusion down
the concentration difference. - ....ANSWER
>>>>Equilibrium Potential
K+ would diffuse down its concentration
gradient until the electrical potential across
the membrane countered diffusion. (moving
from inside the cell down its concentration
gradient to the outside of the cell). -
,....ANSWER >>>>If a membrane were
permeable to only K+ then...
Also called equilibrium potential; if the
membrane were only permeate to K+; the Vm
would be -94mv. - ....ANSWER >>>>Potassium
Nernst Potential
If the membrane were only permeable to Na+
then the Vm would be +61mv. - ....ANSWER
>>>>Sodium Nernst Potential
The resting membrane potential is closest to
the equilibrium potential for the ion with the
highest permeability! - ....ANSWER >>>>The
Goldman Hodgkin Katz Equation
The process during the action potential when
sodium is rushing into the cell causing the
interior to become more positive. (less
negative) - ....ANSWER >>>>Depolarization
, The movement of the membrane potential of
a cell away from rest potential in a more
negative direction. - ....ANSWER
>>>>Hyperpolarization
Membrane potential at which occurrence of
the AP is inevitable - ....ANSWER
>>>>Threshold potential
Portion of the AP where the membrane
potential is positive (cell interior is positive) -
....ANSWER >>>>Overshoot
Also called hyper polarizing after potential;
the portion of the AP, followed by
repolarization where at membrane potential
is more negative than at rest. - ....ANSWER
>>>>Undershoot
Flow of positive charge into the cell
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