Final answer:
Amphetamines are used medically to treat ADHD and narcolepsy; they are CNS stimulants and do not fit the options provided for treatment of insomnia, appetite enhancement, bronchial dilation, or as a CNS depressant.
Step-by-step explanation:
One medical application of amphetamine has been in the treatment of attention deficit hyperactivity disorder (ADHD). Amphetamines are central nervous system (CNS) stimulants and have therapeutic uses in increasing neurotransmitter activity within certain brain areas, like the prefrontal cortex and basal ganglia, which are associated with impulse control. Given the options provided:
- Treatment for insomnia - Incorrect, as amphetamines are stimulants and would more likely cause insomnia.
- Appetite enhancement - Incorrect, amphetamines typically decrease appetite.
- Bronchial dilator - While not a primary use, some stimulants can have bronchial dilating effects; however, this is not the major medical application for amphetamines.
- CNS depressant - Incorrect, as amphetamines are CNS stimulants, not depressants.
Therefore, none of the options listed directly correspond to the primary medical applications of amphetamines, which are the treatment for ADHD and narcolepsy.