Re-uptake results in:     excitement of the neighboring neurons.     more neurotransmitter molecules in the synaptic gap.     less neurotransmitter molecules in the synaptic gap.     unchanged amounts of neurotransmitter molecules in the synaptic gap.

What would happen if we reduced the quantity of acetylcholinesterase in the synaptic cleft, after ACh is released from the pre-synaptic terminal?   Can pick more than one    We would increase the amount of choline and acetyl CoA produced in the cleft. We would have more ACh left in the cleft than if we had a 'normal' quantity of acetylcholinesterase. The ACh in the cleft would remain in the cleft for a longer period of time. We would have greater postsynaptic potentials generated.

Which of the following situations in a neuron results in action potentials that have extended depolarization phases? O None of these result in extended depolarization phase. O Compromising the inactivation mechanism in voltage-gated Na* channels. O Stimulating the voltage-gated K* channels. O Inhibiting the voltage-gated Na* channels. O Compromising the inactivation mechanism in voltage-gated K* channels.

Antidepressants work by O increasing presynaptic GABA secretion. increasing serotonin reuptake by the neuron. decreasing BDNF secretion by neurons. decreasing serotonin reuptake by the presynaptic terminal. All the answers are possible.