L-dopa's efficacy in the treatment of Parkinson's disease decreases after a few years of treatment because
a. as the patient gets older plasma concentrations may increase too fast and produce motor disturbances and adverse psychic effects
b. as the patient gets older plasma concentrations may fall too quickly, allowing the disease symptoms to suddenly appear
c. of continued progression of the underlying cause of the disease
d. all of the above
Question 2
In normal adult humans, alertness, decreased fatigue, improved ability to concentrate, and elevated mood are likely to be observed following administration of low doses of
a. amphetamine
b. cocaine
c. nicotine
d. all of these
Polycystic kidney disease.
Relationship between the number of CAG repeats in a gene and the age of onset of Huntington disease.
(a) The site of Zhoukoudian outside of Beijing, China, spans several hundred thousand years and (b)
Drugs Used in the Treatment of Hyperlipidemia
Drugs Used in the Treatment of Migraine
Location of brain lesions in Alzheimer disease. Plaques are concentrated most heavily in the amygdal