Helen Dunbar and Franz Alexander were instrumental in establishing the earliest organization to study psychological determinants on health. It is called:

Avoidant individuals tend to be

a. happier in large groups than in small ones. b. prone to aggression towards others. c. hypersensitive about signs of rejection. d. relaxed and comfortable in one-to-one settings.

Which of the following neurotransmitters affects neurons involved in sleep, appetite, sensory perception, temperature regulation, pain suppression, and mood?

a. Serotonin b. Dopamine c. Acetylcholine d. Norepinephrine