Flashcards in Q2 Deck (15):
The "patch" action potential is non-propogating, meaning what?
It only occurs once.
What triggers the action potential?
Depolarization of the cell membrane.
Hodgkin and Huxley discovered the Na conductance in the giant axon of what animal?
Equilibrium potentials are based on external and internal concentrations of which 2 ions?
Na and K
T/F: Anesthetics procaine and lidocaine reduce only K conductances.
T/F: Tetrodotoxin is a highly specific blocker of Na channels.
In myasthenia gravis, what loses strength?
Acetylcholine affinity in neuromuscular junctions.
T/F: One treatment for myasthenia gravis decreases acetylcholine.
T/F: Release from inhibition can depolarize a cell.
Is there a critical stimulus current separating "all-or-none"?
Does threshold depend on temperature?
T/F: Small changes in stimulus amplitude have been shown to have a large effect on the postsynaptic response.
Sodium channels are remarkably sensitive to the extracellular concentration of what ion?
Increasing extracellular Ca2+ has what effect on nerve and muscle excitability?