If tryptophan is given in large amounts, it
a. is unlikely to have much effect on the brain unless consumed with the proper mixture of other nutrients
b. generally produces profound alterations in brain functions
c. can increase the synthesis of acetylcholine
d. can reverse the deficits of Alzheimer's disease
Question 2
Which of the following is a criterion for a brain chemical being a neurotransmitter?
a. it should be found in presynaptic neurons
b. there should be mechanisms for terminating its actions
c. when the presynaptic neuron is stimulated, the chemical should be found in the synaptic cleft
d. all of the above
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