Resting Membrane Flashcards
Whats responsible for producing electrical potentials
Cellular mechanism
What’s an electrical potential
the difference in concentration of a charged
particle between one point and another.
What roduces current flow
Ep
when the charged particles flow from
one place to another through ion channels or membranes.
Is the definition of?
Current flow
Neurons communicate by producing Graded potential and Action potential
T
T/f to produce graded potential there must be Resting membrane potential
T
Electrochemical impulses are produced at
Membrane
electrochemical impulses are used to
Transmit signals
T or f
Changing in membrane potential in muscles activate many of the cell functions
T
Selectivity of ion channels is based on
Charge lining the channel
Size of channel
True or false
Most of ion channels are leaky
F, gated
activation gate on Na+ channel opens by
depolarization
The magnitude (amount) of a diffusion
potential is measured in
Mv
The magnitude (amount) of a diffusion
potential is dependent upon
size of concentration gradient
Size of this force is determined by
diffusion of
the charged ions.
The Nernst equation is used to calculate the
equilibrium potential
RMP is established by
diffusion potential
Some gates are leaky, some are gated. Depending upon?
The POSITION of the gate
True or false
Voltage gated channels are controled by membrane potential
True
a diffusion
potential is caused by
Diffusion of iona
diffusion potential magnitude is dependent upon
Size of concentration gradient
True or false
Movement of ions across membrane causes flow of current
T
Size of the electrical force is determined by
Diffusion of charged ions
Equilibrium potential of k
94- w negativity inside and positivity outside
Equilibrium potential for na
61 with positivity inside and negativity outside
The Nernst equation is used to calculate?
equilibrium potential
True or false
Nernst equation converts concentration difference of an ion into a voltage
T
…..equation is used to determine the resting membrane potential
(RMP) in the cell with involvement of Na, K and Cl ions
Ghk
The voltage difference across the cell membrane of
excitable cells with negativity inside and positivity outside when membrane is not responding to any stimulus is called
Rmp
RMP is established by
diffusion potential
True or false
Ions with highest permeability will make greatest
Contribution to rmp
True
True or false
In resting condition more leaky K+ channels
are open than Na+
T
RMP (-90) is closer to EP of K (-94) because of its
High premeability
For generation of resting
membrane potential (RMP) only K leaky channels and Na-K pump are important
True
Having a membrane potential does
make membrane excitable
F
Excitability depends upon the
possibility of depolarization
True or false
Cation is more effective in changing Vm
F. Both cations and anion are equally affective in changing Vm
How is a graded potential produced
stimulation causing opening of ligand or mechanism gated channel
……the part of neuron from
where axon arises
Axon hillock
The electrical difference across the
membrane is measured by using a
Microelectrode
What activates glands celk functions
Change in membrane potential
What type of signals are graded and action potential
Electrical
