According to the text, the emotional exhaustion that often affects middle-aged people in the helping professions is called:

Excitotoxicity is mediated by overstimulation exerted by which neurotransmitter

a) serotonin b) DA c) ACh d) GABA e) glutamate

Mobombi had completed about a quarter of the distance in the marathon in which he was a participant. Suddenly, he stumbled and fell. Despite feeling a sharp pain initially, he got up and continued to run until he completed the race

Upon crossing the finish line he fell down writhing in pain. When checked out, it was discovered that Mobombi had broken his leg. He was able to run the remainder of the marathon relatively pain free due to the release of A) enzymes. B) amino acids. C) monoamines. D) endorphins.