BIPN 100 Quizes Questions and Answers well Explained Latest 2024/2025 Update 100% Correct.
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Course
BIPN 100
Institution
BIPN 100
A postsynaptic potential is excitatory (EPSP) if the ion involved has a reversal potential (Eion) that is more
depolarized than the resting membrane potential (Vm or Vrest), even if that Eion is hyperpolarized to the
threshold for firing an action potential. - False
why?>>
For a postsynap...
BIPN 100 Quizes
A postsynaptic potential is excitatory (EPSP) if the ion involved has a reversal potential (Eion) that is more
depolarized than the resting membrane potential (Vm or Vrest), even if that Eion is hyperpolarized to the
threshold for firing an action potential. - False
why?>>
For a postsynaptic potential to be excitatory, the reversal potential for the ion involved must be
depolarized to the threshold for firing an action potential. An EPSP increases the likelihood of firing. If
Eion is negative to threshold, opening all its channels reduces the likelihood of firing.
An EPSP causes a depolarization of 15 mV on a proximal dendrite. At the same time, an IPSP causes a
hyperpolarization of 10 mV in a different proximal dendrite. - Maybe. We don't have enough
information to answer this.
It depends on factors like "how much will the graded potentials decay before they arrive at the hillock".
In short, if the axon hillock (trigger zone) is depolarized beyond -55 mV, the answer is "yes". If not, then
"no".
Response Feedback:
Various factors will contribute to the decay of graded potentials. In this case, it is possible both the IPSP
and EPSP will summate to prevent AP firing. But we don't know for sure!
Increasing the amount of action potentials that arrive at the presynaptic terminal will: - Increase
the amount of depolarization in the terminal
Increase the amount of Ca2+ that enters the presynaptic terminal.
Increase the number of vesicles that fuse with the presynaptic membrane
Increase the amount of neurotransmitter released.
What would happen if we reduced the acetylcholinesterase in the synaptic cleft? - We would have
more ACh in the cleft.
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