You have just observed that each action potential in a burst can trigger additional neurotransmitter release. If carcium ions are removed from the extracellular solution, what will happen to neurotransmitter release at the axon terminal?
• There will be no change in neurotransmitter release.
• There will be more neurotransmitter release.
• There will be less neurotransmitter release.
• There will be no neurotransmitter release.
1 answer
If calcium ions are removed from the extracellular solution, there will be no neurotransmitter release. This is because the influx of calcium ions into the axon terminal is a crucial step for triggering the exocytosis of neurotransmitter-filled vesicles. Without calcium, the necessary signaling pathway for neurotransmitter release cannot occur.
So, the correct answer is:
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