Adrian has Alzheimer's and has a difficult time with his memory. The doctors say that his memory difficulties are associated with low levels of ____.
a. acetylcholine
b. dopamine
c. dratonin
d. serotonin
Question 2
Three types of chemical substances appear to be involved in neurotransmission: ____.
a. monoamine neurotransmitters, amino-acid neurotransmitters, and neurobinders
b. monoamine neurotransmitters, amino-acid neurotransmitters, and neuropeptides
c. amino-acid neurotransmitters, neurobinders, and cerebropeptides
d. monoamine neurotransmitters, neuropeptides, and neurobinders