Based on the fact that stimulant medications have been used ...

[HCHenry]

Based on the fact that stimulant medications have been used effectively to treat ADHD, it is believed that the disorder may be caused by ____.
 
  a. inadequate levels of acetylcholine in the central nervous system
 b. an excess of serotonin in the central nervous system
 c. an excess of norepinephrine in the central nervous system
 d. inadequate dopamine and associated neurotransmitters that affect sign-flow to and from the frontal lobes

Question 2

What research findings provide an optimistic outlook suggesting that many children with ADHD eventually outgrow the disorder?
 
  a. neuroimaging studies that have found differences in ventricular size
 b. neuroimaging studies that have found developmental delays in the prefrontal regions of the brain
 c. twin studies that have found support for the role of environmental factors in ADHD
 d. drug studies that have explored the effect of dopamine levels on behavior and emotional functioning

[blakeserpa]

Answer to Question 1

d

Answer to Question 2

b