Inspiration- Active process (requires energy)
- Intercostal muscles and diaphragm contract.
- The diaphragm is flat.
- The thorax increases therefore there is less pressure in the lungs causing airflow into the lungs
- The ribcage moves upwards and outwards
Expiration- Passive process (doesnt require energy)
- Intercostal muscles and diaphragm is relaxed
- The diaphragm is curved
- The thorax volume decreases causing more pressure in the lungs
- Air is forced out the lungs
- The ribcage moves downwards and inwards
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Spirometer, Tidal volume, and vital capacity defin
- is a machine that can give readings of Tidal volume, Vital capacity, oxygen intake and breathing rate
- The volume of air breathed in and out when at rest. Usually about 0.5dm
- The maximum volume of air breathed in plus the maximum volume of air breathed out.
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- An oxygen chamber filled with water.
- Attached to it is a movable lid.
- When you breathe in and out the lid moves up and down.
- A pen is attached on to the lid and is touching down on a piece of paper.
- The pen traces the pattern of the moving lid.
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