AQA AS Biology Unit 1 3.1.4 Lungs and Lung Disease

I made these revision notes using my class notes, the AQA AS Biology textbook and the specification.

If you have any corrections or queries please leave them in the comments and I'll try and help :)

Good luck in your exams :) **

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Revision: Unit 1 Biology and Disease 3.1.4 Lungs and Lung Disease

Lung Function

As you breathe in, air enters the trachea.
The trachea splits into two bronchi.
o One bronchus leading to each lung.
Each bronchus then branches off into smaller tubes called bronchioles.
The bronchioles end in small `air…

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O2 diffuses out of the alveoli, across the alveolar epithelium and the capillary endothelium.
CO2 diffuses into the alveoli the blood, and is breathed out.
Diffusion of gases between the alveoli and the blood will be very rapid because:
o Red blood cells are slowed as they pass through pulmonary…

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Pulmonary ventilation the volume of air taken into the lungs in one minute.
Tidal volume the volume of air in each breath.
Ventilation rate the number of breaths per minute.

Lung Disease

Pulmonary Tuberculosis (TB)

Causes and Symptoms
o TB is caused by the bacteria Mycobacterium tuberculosis or Mycobacterium bovis.…

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Airways become inflamed and irritated
o Usually due to an allergic reaction e.g. pollen and dust.
During an asthma attack, the smooth muscle lining the bronchioles contracts and a large amount of mucus is
Causes constriction of the airways, makes it difficult for the sufferer to breathe properly.…




thank you ever so much! These are so useful

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