Chemical substances that can block or reduce a cell's response to the action of other chemicals or neurotransmitters are called:

In the U.S., a growing proportion of prescriptions for stimulant medication for ADHD are being written by:

a) Psychologists b) Family doctors c) Psychiatrists d) Nurses

The left-hemisphere is dominant for speech in

A) all left-handers and a few right-handers. B) nearly all left-handers and a few right-handers. C) nearly all right-handers and the majority of left-handers. D) nearly all right-handers and only a few left-handers. E) a few right-handers and even fewer left-handers.