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3 Cards in this Set
- Front
- Back
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DRUGS |
A drug is a chemical that affects the central nervous system. So a drug can change your psychological behaviour, which is the way your think or feel. For example, narcotics are drugs which make you feel sleepy. Some drugs cause addiction. This means that the person becomes dependent on taking the drug and feels they cannot function properly without it. A painkiller (e.g. Morphine) blocks nerve impulses from pain receptors so you don't feel as much pain. A stimulant (e.g. Caffeine) increases neurotransmission at synapses, so increases speed of reaction, which reduces reaction time. A depressant (e.g. Alcohol) slows the activity of the brain, so increases reaction time. A hallucinogen (e.g. LSD) changes perception, e.g. colours seem brighter; can make it difficult to distinguish between real or not real. |
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SMOKING |
Carbon Monoxide reduces how much oxygen the blood can carry. Chemicals in tar are carcinogens that cause cancers, particularly of mouth and lungs. The nicotine is the addictive part of the cigarette. This is what makes it hard for people to give up smoking. |
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ALCOHOL |
Drinking a lot of alcohol at one time can cause short-term harm including: Drinking a lot of alcohol over a long period can cause long-term harm including: |
