PSL 425 Quiz 5 Week 15 UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS
The depolarizing phase of the action potential is tetrodotoxin (TTX) and saxitoxin (STX)
mediated by voltage-dependent Na+ channels that are
specifically blocked by nanomolar concentrations of the
small guanidinium neurotoxins...
___ is not only the first but also the last step in An action potential
transmission at the neuromuscular junction
Selective blockade of the muscle action potential can be µ-conotoxin
achieved with a unique toxin called...
If an intact nerve-muscle preparation is exposed to µ- stimulation of the nerve still evokes the release of ACh, but the muscle action
conotoxin,... potential is completely eliminated
dendrotoxin has an effect that is precisely opposite that it facilitates the release of ACh that is evoked by nerve stimulation
of tetrodotoxin: _____
Blockade of presynaptic K+ channels by dendrotoxin repolarization of the presynaptic membrane, thereby prolonging the duration of
inhibits... the action potential and facilitating the release of transmitter in response to the
entry of extra Ca2+ into the nerve terminal
___ block N-type Ca2+ currents in a virtually irreversible ω-conotoxins
fashion
Inhibition of neurotransmitter release is manifested as an EPP when the preparation is stimulated via the nerve
abolition of muscle...
ANSWERS
The depolarizing phase of the action potential is tetrodotoxin (TTX) and saxitoxin (STX)
mediated by voltage-dependent Na+ channels that are
specifically blocked by nanomolar concentrations of the
small guanidinium neurotoxins...
___ is not only the first but also the last step in An action potential
transmission at the neuromuscular junction
Selective blockade of the muscle action potential can be µ-conotoxin
achieved with a unique toxin called...
If an intact nerve-muscle preparation is exposed to µ- stimulation of the nerve still evokes the release of ACh, but the muscle action
conotoxin,... potential is completely eliminated
dendrotoxin has an effect that is precisely opposite that it facilitates the release of ACh that is evoked by nerve stimulation
of tetrodotoxin: _____
Blockade of presynaptic K+ channels by dendrotoxin repolarization of the presynaptic membrane, thereby prolonging the duration of
inhibits... the action potential and facilitating the release of transmitter in response to the
entry of extra Ca2+ into the nerve terminal
___ block N-type Ca2+ currents in a virtually irreversible ω-conotoxins
fashion
Inhibition of neurotransmitter release is manifested as an EPP when the preparation is stimulated via the nerve
abolition of muscle...
