Answer:
They increase the levels of catecholamines—a family of brain chemicals that includes dopamine.
Explanation:
Stimulants are a class of drugs that “stimulate” the body's central nervous system, which includes the brain and spinal cord. They increase the levels of catecholamines—a family of brain chemicals that includes dopamine. These chemicals are used in the brain processes to signal reward and motivation.
Answer:
C
Explanation:
Increasing enzyme concentration will speed up the rate of a reaction, as long as there is substrate available to bind to.
