Question

People who suffer from attention-deficit/hyperactivity disorder (adhd) tend to have unusually low levels of ___________. select one:
a. dopamine
b. epinephrine
c. norepinephrine
d. gamma-aminobutyric acid (gaba)

Answer 1

People who suffer from attention-deficit/hyperactivity disorder (ADHD) tend to have unusually low levels of dopamine.  

ADHD is a brain disorder characterized by problems in paying attention and excessive activity and it is suggested that lower levels of dopamine (elevated number of dopamine transporters) are associated with symptoms of ADHD. ADHD is associated with functional impairments of dopamine pathways and also norepinephrine pathways because these pathways are responsible for modulating executive function (cognitive control of behaviour).

Answer 2

GABA

GABA is a neurotransmitter which helps in the inhibition of signals in the central nervous system. GABA blocks the nerve impulse so the neurons will not fire too often. This is also important in maintaining muscle tone. It is speculated that people with ADHD has GABA deficiency. The inadequacy of GABA can lead to insomnia, depression, mood swingsm aggression, irritability and other problems.