Tranquilizers like Xanax work to diminish anxiety symptoms by stimulating the receptor sites for _____, thereby driving down neuronal activity at those sites

Pain-controlling chemicals in the body are called __________

a) neural regulators. b) histamines. c) androgens. d) endorphins.

Gray matter shows a rapid increase in the first ______________and grows more slowly after that

a. two years b. five years c. ten years d. 20 years