Potassium ion channels open ____, resulting in ____
a. as the action potential passes down the axon; a more negatively charged axon cytoplasm
b. when the threshold potential is reached; the opening of more sodium channels
c. during the resting potential; the diffusion of sodium ions into the axon cytoplasm
d. when the action potential reaches the axon terminal; a more positively charged axon cytoplasm
e. when neurotransmitters attach to dendrite receptors; no difference in the charge of the axon cytoplasm
ANSWER: a
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