Physiology - Resting membrane potential Flashcards
a tendency to have recurrent seizures is known as..
epilepsy
a seizure is..
a. lack of electrical activity in the brain
b. sudden burst of intense electrical activity
b.sudden burst of intense electrical activity
acute kidney failure, chronic kidney disease and type 1 diabetes can all cause
a. hypokalaemia
b. hyperkalaemia
c. hyponaturia
d. hypernaturia
b.hyperkalaemia
weakness, arrhythmias, paralysis, muscle fatigue and nausea are associated with..
epilepsy
what type of diabetes can cause hyperkalaemia
a. 1
b. 2
a.1
what are excitable cells
cells capable of generating self propagating electrical signals
what is the resting membrane potential
a. -55 mV
b. -70 mV
c. -80 mV
d. +70 mV
b.-70 mV
which is true for inside the cell compared to outside
a. higher sodium
b. lower potassium
c. lower sodium
c.lower sodium
which ion has most contribution to resting membrane potential?
a. na
b. k
c. fe
d. ca
b. k
what is diffusion potential caused by
a. moveent of K+ out the cell via leak channels
b. voltage gradient opposing further k+ diffusion out
a.moveent of K+ out the cell via leak channels
diffusion potential increases until..
a. higher than voltage gradient
b. lower than voltage gradient
c. equilibrium reached
d. equilibrium breached
c. equilibrium reached
the potential difference when conc gradient and voltage gradient are in eqm are known as..
equilibrium potential for K+
Ek
what equation is used to find Ek
a. faradays
b. ficks
c. nernst
c.nernst
what is the membrane more permeable to
a. potassium
b. sodium
a.potassium
what pd is the ENa (eqm for Na)
a. -65 mV
b. -70 mV
c. -80 mV
d. +70 mV
a.-65 mV
which of these is RMP closer to?
a. Ek
b. Ena
a.Ek
a=
permeability to na/ permeability to k
what is responsible for maintaining transmembrane conc gradients
a. k leak channels
b. sodium channels
c. sodium potassium pump
c.sodium potassium pump
what is pumped by the sodium potassium pump
a. 3 sodium out, 2 potassium in
b. 2 sodium out, 3 potassium in
c. 2 sodium in, 3 pottasium out
a.3 sodium out, 2 potassium in
what effect does the sodium potassium pump have on overall charge on the cell
a. net loss of positive charge
b. net gain of positive charge
a.net loss of positive charge
what is the role of pottasium channels in neurons
a. stimulation
b. propagation
c. brake
c.brake
what effect does opening of pottasium channels have on rmp
b. hypopolarisation
c. hyperpolarisation
c.hyperpolarisation
