Jill trains her dog, Boozer, to come to her when she snaps her fingers. She snaps her fingers, then gives the dog a bit of food when it approaches. Finger snapping is a(n) _________

Common effects of amphetamines include all of the following except

a. Euphoria. b. Increased confidence c. A worsening of attention. d. Diminished fatigue.

Cells found in the nervous system that insulate, nourish, and remove waste products from neurons are known as

a. neurotransmitters. b. myelin sheaths. c. glia. d. synapses.