B1E REVISION NOTES

SINGLE SCIENCE, OCR BOARD - HIGHER TIER, BIOLOGY - B1E

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Drugs and you
A drug is a chemical that affects the body and / or the
brain
Drugs can be used as medicine or for pleasure
Some drugs that are used for pleasure are legal, like
cigarettes and alcohol
Some drugs are illegal, like heroin and cocaine
There are five main groups of drugs

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Depressants
Alcohol
Solvents
Temazepan
Slows down the brain by slowing down the synapses
Makes you feel tired and lethargic
Causes forgetfulness and slow reactions…read more

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Hallucinogens
Cannabis
LSD
Distorted sensations, emotions and perceptions…read more

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Painkillers
Aspirin
Heroin
Nerve impulses blocked
Reduces pain
Some can be addictive…read more

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Performance enhancers
Anabolic steroids
Increases muscles development…read more

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Stimulants
Nicotine
Ecstasy
Caffeine
Increases brain activity by stimulating the synapse
Illegal drugs
Illegal drugs can be harmful
They can cause side effects and can lead to addiction or
death…read more

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Even medicines have side effects and can be deadly if
used incorrectly which is why most are only available on
subscription
In the UK drugs are classified into three main groups
Effects of smoking
Cigarette smoke contains over 200 chemicals, the most
important being :
Carbon monoxide
Tar
Nicotine…read more

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The smokers cough
Cells that line the trachea and bronchioles are called
epithelial cells
Some cells have ting hairs called cilia and others make
sticky mucus
Cigarette smoke stops the cilia from moving
Dust and particulates collect and irritate cells
Smokers coughs moves this upwards so it can be swallowed…read more

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Smoking has been reduced in the last few years by :
Banning smoking in public places
Banning advertising
Producing help lines, nicotine patches and education
Channing the images ­ more uncool
More warnings
Alcohol
Alcohol slows the brain by slowing the neurone
transmitters' and so increases reaction time
It can also affect balance
It causes vasodilatation, which increases blood flow causing
heat loss
Excess alcohol can cause unconsciousness, coma and / or
death…read more

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The effect of alcohol on the liver
The liver breaks down toxic chemicals such as alcohol
The alcohol content of a drink is measured in units of
alcohol
The amount of alcohol in drinks varies
One unit of alcohol contains 10ml of pure alcohol
Half a pint ( 250ml ) of ordinary beer, one small glass of
wine and one pub measure of spirits all contain one unit of
alcohol
Alcopop drinks contain about one and a half units of
alcohol
Alcohol kills liver cells…read more

Comments

Miss Meera J

Very helpful :)

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