Which of the following are defined by large fissures on the surface of the cortex or are regarded as separate areas because of their function?

Widely abused illegal drugs such as cocaine, heroin, and amphetamines are attractive to users because

a. they stimulate the brain's "reward circuits." b. they helped our ancestors survive and reproduce. c. they suppress REM sleep. d. they slow down mental and physical activity. e. they produce hallucinations and delusions.

Which of the following is a function of reflexes?

A) Reflexes are voluntary movements. B) Reflexes are elicited by external stimuli. C) Reflexes serve as protective mechanisms. D) Reflexes allow the spinal cord to communicate with the brain.