Brain slices are bathed in a concentrated K+ solution to stimulate neurotransmitter release. Why must Ca2+ ions also be present in the bathing solution? Choose the correct option
A) It causes a large membrane depolarization.
B) It helps keep the brain slices alive.
C) Transmitter release requires the entry of Ca2+ into the axon terminal.
D) It stimulates many synapses in a region of the brain.
Ans: C
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