| A | B |
|---|
| epinephrine | hormone prod by adrenal medulla and relased into bldstream |
| positiv feedback loop | release of substance acts to promote its further release |
| negative feedback loop | release of substance acts to inhibit its subsequent release |
| pheromones | hormones that are relased into air rather than into bldstream |
| opiates | drugs, such as heorin and morphine, that prod decreased percept'n of pain and a strong sense of emotional well-being |
| endorphins | naturally occurring peptides w/ opiate-like effects |
| substance P | nt released by sensory pain Rs when an anim is exposed to a painful event |
| neuromodulators | class of cheicals, including endorphins, that controls amt of nts released at presynaptic memb |
