substance which initiates physiological response when combined with receptor. Drug that can combine with a receptor on a cell to produce a physiological reaction.

Having a tendency to become uneasy or anxious.

small sac-shaped organ beneath liver, in which bile is stored after secretion by liver and before release into intestine.

support or actively encourage.

situated on other or further side. in opposite position. Person, thing that is totally different to another. facing.

involuntary or unconscious.

of pair of ductless glands situated above kidneys. adrenal gland.

involving unbreakable obligation. Something used to tie or bind things e.g. books. To join people who share something into a group.

able to be done. candidate for job.

action or process of releasing or being released. To allow a film, music etc. to be sold/distributed.

become able to see clearly.

Catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action.

(Of the iris of the eye, etc.) to get bigger.

in way that is not directly caused by something.

To move someone to a higher position or rank.