junction between two nerve cells, consisting of minute gap across which impulses pass by diffusion of neurotransmitter. Junction between neurons in the brain.

colourless volatile flammable liquid which is intoxicating constituent of drinks.

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chemical substance which is released at end of nerve fibre by arrival of nerve impulse and, by diffusing across synapse or junction. Chemical substances, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse.

physical feeling or perception resulting from something that happens to or comes into contact with body. A feeling experienced by the body e.g. touch.

drug or other form of medicine that is used to treat or prevent disease. Substance to relieve pain or cure sickness.

antidepressant drug of tricyclic group. A tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications.

rheumatic condition characterized by muscular or musculoskeletal pain.

able to be used or obtained.

rise in size, amount, or degree of something. Amount something grows by. To make or become larger in size or amount.

. noradrenaline.

degree of remoteness or separation. To make someone leave his or her job or position.

To control something with rules or laws.

action of blocking or obstructing person or thing. To stop from going forward or making progress.