Science Health And Lifestyle (revision)

Smoking
Smoking is very harmful to health. It’s estimated that nearly one in every five deaths (of adults aged over 35 in England) is connected to smoking.
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Smoking
Tobacco smoke contains many harmful substances. These include: tar, nicotine ,carbon monoxide
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Tar
Tar causes cancer of the lungs, mouth and throat. It coats the inside of the lungs, including the alveoli, causing coughing. It damages the alveoli, making it more difficult for gas exchange to happen.
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Smoke
Cells in the lining of the trachea, bronchi and bronchioles produce sticky mucus. This traps dirt and microbes. Cells with tiny hair-like parts, called cilia then move the mucus out of the lungs.
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Smoke
However, hot smoke and tar from smoking damages the cilia. As a result of this, smokers cough to move the mucus and are more likely to get bronchitis.
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Nicotine
Nicotine is addictive. It causes a smoker to want more cigarettes. Nicotine also increases the heart rate and blood pressure, and makes blood vessels narrower than normal. This can lead to heart disease.
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Carbon monoxide
Carbon monoxide is a gas that takes the place of oxygen in red blood cells. This reduces the amount of oxygen that the blood can carry. It means that the circulatory system has to work harder, causing heart disease.
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Drugs
A drug is a substance that has an effect on the body: medicines are drugs that help people suffering from pain or disease,recreational drugs are taken by people because they like the effects they have on their bodies
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Drugs
Some recreational drugs are legal, such as tobacco and alcohol, although there are restrictions on who can buy them. Caffeine, found in coffee, is another recreational drug. Most other recreational drugs are illegal, and these include cannabis.
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Drugs
Recreational drugs can be classified as a depressant or a stimulant. Most recreational drugs can be addictive.
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Depressants
A depressant slows down messages in the brain and along the nerves. Alcohol is a depressant. It is found in beer, wines and spirits such as vodka. Other depressants include heroin and solvents (found in glue and aerosols).
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Depressants
Here are some of the typical effects depressants have on the body: feelings of well-being,lowered inhibition,slowed thinking,slowed muscular activity,a distorted view of the world, or hallucinations
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Depressants
Some of the long-term effects of depressants on the body include damage to the liver, brain and heart. They can also have the following effects: alcohol can cause weight gain, solvent abuse causes a rash around the nose and mouth
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Other cards in this set

Card 2

Front

Smoking

Back

Tobacco smoke contains many harmful substances. These include: tar, nicotine ,carbon monoxide

Card 3

Front

Tar

Back

Preview of the front of card 3

Card 4

Front

Smoke

Back

Preview of the front of card 4

Card 5

Front

Smoke

Back

Preview of the front of card 5
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