Continued exposure to high doses of amphetamine eventually ...

[Tazate]

Continued exposure to high doses of amphetamine eventually results in
 
  a. catecholamine depletion
  b. decreased extraneuronal metabolization
  c. increased catecholamine synthesis
  d. increased levels of monoamine oxidase

Question 2

Low to moderate doses of amphetamine-related drugs generally
 
  a. increase virtually all motor activities
  b. enhance performance on tasks requiring sustained attention
  c. enhance performance most dramatically when the person is fatigued
  d. only b and c

[Mollythedog]

Answer to Question 1

a

Answer to Question 2

d

[Tazate]

Excellent

[bassamabas]

Thanks for the timely response, appreciate it