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Lungs, Air and Smoke

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Investigate the Carbon Dioxide Levels of Inhaled and Exhaled Air
In this experiment we will investigate the carbon dioxide levels of inhaled and exhaled air. We use limewater to test for the presence of carbon dioxide.
Exhaled air contains:
- more carbon dioxide produced as a waste product of energy production
- less oxygen as it has been used in respiration

Smoking and health
Tobacco smoke contains many harmful substances. These include: 1. Tar
Tar causes cancer of the lungs, mouth and throat. It coats the surface of the breathing tubes and the alveoli. This causes coughing and damages the alveoli, making it more difficult for gas exchange to happen.

2. 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.

3. 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. This means that the circulatory system has to work harder, causing heart disease.

Investigate how Smoking affects your Lungs?
Test with cotton balls to determine the real effects of smoking a pack a day and what it does to your mouth, throat and lungs.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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