Multiple Choice
Presynaptic facilitation by serotonin is caused by
A) increased extracellular concentration of sodium ion.
B) increased extracellular concentration of potassium ion.
C) blockage of calcium channels in the presynaptic membrane.
D) calcium channels in the presynaptic membrane remaining open longer.
E) temporal summation.
Correct Answer:

Verified
Correct Answer:
Verified
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