action potential lab Flashcards
what is action potential?
rapid rise and fall in voltgae or membrane potential across cell membrane
what is a stimulus
starts the change in voltage or action potential
what is depolarization
rapid rise of memebrane potential becuase of the infux of Na channels
what is repolarization?
rapid na channel inactivation and large efflux of K+ ions
what is hyperpolarization?
membrane gets lowered due to efluz of K+ And closing of K channels
what is resting state
membrane potential returns to resting voltage before stimulus was inglicted
true or false
action potential all or nothing
true
why was leeches used
they have a cluster of neurons
Na+ is highly concentrated inside or outside of a neuron?
outside
What explains best, Why the resting membrane potential of a neuron is negative?
High K+ permeability, low Na+ permeability
Which describes below the correct order of events of an action potential?
Stimulus, Depolarization. Repolarization, Hyperpolarization, Resting State
Based on the protocol, how can we identify that we were successfully able to impale the leech neuron?
A sharp negative deflection
Leech neurons typically have membrane potentials of:
-20 mV
