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Chapter 5 Lungs and Lung disease From AQA Nelson Thornes

4.1 Structure of Human gas-exchange system

In all aerobic organisms there need to be a constant supply of oxygen to release ATP during respiration. A
build of CO2 which needs to be removed could be dangerous if still left in…

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Chapter 5 Lungs and Lung disease From AQA Nelson Thornes

Inspiration

Breathing is an active process and it requires energy, it occurs:
- The external intercostal muscles contract whilst in internal in costal muscles relax.
- The ribs are pulled upwards and out, to increase the volume in the thorax.…

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Chapter 5 Lungs and Lung disease From AQA Nelson Thornes

- The walls of the alveoli and capillaries are both really thin and the diffusion pathway is very short.
- Alveoli and capillaries have a very big surface area.
- Breathing movements constantly breathing movements constantly ventilate the lungs, and…

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Chapter 5 Lungs and Lung disease From AQA Nelson Thornes

- More and better housing.
- Improved health facilities and housing.
- Better nutrition from food, so that the immune system is not weakened by a poor diet.
Other ways to control TB is through drugs, but this can take…

Page 5

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Chapter 5 Lungs and Lung disease From AQA Nelson Thornes

1 in 5 smokers will develop this in their lifetime, it develops after 20 years and so it is hard to diagnose it until
the lungs have been irreversibly damaged. In healthy lungs, there is a large amount of elastic…

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