AQA GCSE B3: Ventilating the Lungs

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AQA GCSE Biology 3
1.5. Ventilating the lungs
The Lungs contain the exchange surface of the breathing system
Situated in the thorax(upper part of body), inside the ribcage and above the
diaphragm
The diaphragm separates the lungs from the abdomen
When we breathe in...
The intercostal muscles between the ribcage and the diaphragm contract
The ribcage moves up and out
The diaphragm becomes flatter
This increases the volume inside the thorax
Which reduces the air pressure
Air diffuses into the lungs
This is called inhaltion
When we breathe out...
The intercostal muscles between the ribcage and the diaphragm relax
The ribcage moves down and in
The diaphragm moves upwards into a domed shape
The volume inside the thorax decreases
Ergo the pressure increases
Air diffuses out of the lungs
This is called exhaltion

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