1. When the stimulus intensity is increased, what changes: the number of synaptic vesicles released or the amount of neurotransmitter per vesicle?
The number of synaptic vesicles released increases when the stimulus intensity increases.
2. What happened to the amount of neurotransmitter release when you switched from the control extracellular fluid to the extracellular fluid with no Ca21? How well did the results compare with your prediction?
Without calcium present, no neurotransmitter was released because the exocytosis of the synaptic vesicles is dependent upon calcium.
3. What happened to the amount of neurotransmitter release when you switched from the extracellular fluid with no Ca21 to the extracellular fluid with low Ca21? How well did the results compare with your prediction?
When a small amount of calcium is added back, a small amount of synaptic vesicles are released.
4. How did neurotransmitter release in the Mg2+ extracellular fluid compare to that in the control extracellular fluid? How well did the result compare with your prediction? The neurotransmitter release was less when magnesium was added.
5. How does Mg21 block the effect of extracellular