Electro Physiology Flashcards
causing both depolarization and repolarization of the nerve membrane during action potential?
a. Potassium Channel
b. Voltage-gated sodium channel
c. Na-k pump
d. diffusion potential
b. Voltage-gated sodium channel
Reference:
guyton ang hall
pg. 61
plays an important role in increasing the rapidity of repolarization of the membrane
a. Voltage-gated potassium Channel
b. Voltage-gated sodium channel
c. Na-k pump
d. diffusion potential
b. Voltage-gated potassium channel
Reference:
guyton ang hall
pg. 61
epithelial sodium channels (ENaCs) are inhibited by the?
a. K channels
b. aquaporins
c. Na, K ATpase
d. diuretic amiloride
“Diuretic amiloride”
reference:
Ganong’s Review of Medical Physiology
23rd edition
pg. 47
it is the diffusion potential that balances the tendency for diffusion that is caused by concentration gradient.
a. Equilibrium potential
b. Electrochemical equilibrium
c. Resting membrane potential
d. Repolarization
a. Equilibrium potential
are opened or closed by changes in membrane potential
a. Ligand-gated channels
b. Voltage-gated channels
c. Diffusion potential
d. Action potential
b. Voltage- gated channels
are opened or closed by hormones, second messengers or neurotransmitters. When open, it is permeable to Na and K causing the motor and plate to depolarize.
a. Ligand-gated channels
b. Voltage-gated channels
c. Diffusion potential
d. Action potential
a. Ligand-gated channels
is the potential difference generated across a membrane because of a concentration difference of an ion. It can be generated only if the membrane is permeable to the ion.
a. Ligand-gated channels
b. Voltage-gated channels
c. Diffusion potential
d. Action potential
c. Diffusion potential
is established by diffusion potentials that result from concentration differences of permanent ion.
a. Equilibrium potential
b. Resting membrane potential
c. Diffusion potential
d. Action potential
b. Resting membrane potential
contributes only indirectly to the resting membrane potential by maintaining, across the cell membrane, the Na and K concentration gradients that then produces diffusion potentials.
a. K channels
b. aquaporins
c. Na-K pump
d. diuretic amiloride
c. Na-K pump
is a property of excitable cells that consists of a rapid depolarization, or upstroke, followed by repolarization of the membrane potential.
a. Equilibrium potential
b. Resting membrane potential
c. Diffusion potential
d. Action potential
d. Action potential
is the membrane potential at which the action potential is inevitable
a. Equilibrium potential
b. Threshold
c. Diffusion potential
d. Action potential
b. Threshold
blocks voltage-sensing Na channels and abolish action potentials.
a. Tetrodotoxin (TTX)
b. Lidocaine
c. Both
d. Neither
c. Both
repolarization is caused by?
a. outward K current
b. outward Na current
c. inward K current
d. inward Na current
a. outward K current
occurs when another action potential cannot be alicited, no matter how large the stimulus.
a. Absolute refractory period
b. Relative refractory period
c. accommodation
d. myelination
a. absolute refractory period
An action potential can be elicited during this period only if a larger than usual inward current is provided
a. Absolute refractory period
b. Relative refractory period
c. accommodation
d. myelination
b. Relative refractory period
this can be seen in hyperkalemia, in which the skeletal muscle membranes are depolarized by the high serum K concentration
a. Absolute refractory period
b. Relative refractory period
c. accommodation
d. myelination
c. accommodation
this exhibit saltatory conduction because action potentials can be generated only at the nodes of Ranvier, where there are gaps in the myelin sheath.
a. Myelinated nerves
b. myelination
c. accomodation
d. nerve fiber
a. Myelinated nerves
