Drugs and the human body

Drugs and the human body

Drug testing

Certain drugs can be extracted from natural sources, and have been known about for a long time.

Stimulants and depressants affect the synapses between neurones in the nervous system:

• Stimulants cause more neurotransmitter molecules to diffuse across the synapse
• Depressants stop the next neurone sending nerve impulses. They bind to the receptor molecules the next neurone needs to…