A neuron is unable to produce another action potential under any circumstances during the
a. absolute refractory period.
b. relative refractory period.
c. depolarization phase of the action potential.
d. hyperpolarization phase of an action potential.
Question 2
Tetrodotoxin, the poisonous substance produced by the puffer fish, interacts with which of the following?
a. sodium channels that are dependent on voltage
b. calcium channels located at the axon terminal
c. hydrogen channels located on postsynaptic dendrites
d. potassium channels located on the axon membrane
Endosymbiosis in Action
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