During inspiration- what happens to the intercostal muscles?
The internal intercostal muscles relax and the external intercostal muscles contract
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During inspiration- where do the ribs move?
Upwards and outwards
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During inspiration- what happens to the diaphragm?
The diaphragm contracts, flattening out to increase the volume of the thorax
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What happens to the pressure and air movement as the thorax volume increases?
The pressure decreases as the thorax volume increases, meaning the atmospheric pressure is greater than the pulmonary pressure so air is being forced into the lungs
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During expiration- what happens to the intercostal muscles?
The internal intercostal muscles contract and the external intercostal muscles relax
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During expiration- where do the ribs move?
The move inwards and downwards
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During expiration- what happens to the diaphragm?
The diaphragm relaxes, causing it to regain its curved shape and decreasing the volume of the thorax
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What happens to the pressure and air movement as the thorax volume decreases in expiration?
The pulmonary pressure is greater than the atmospheric pressure as the volume of the thorax decreases, so air is forced out of the lungs
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What is ventilation (breathing)?
A process to maintain diffusion of gases across the alveolar epithelium, air is constantly moved in and out of the lungs
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Other cards in this set
Card 2
Front
During inspiration- where do the ribs move?
Back
Upwards and outwards
Card 3
Front
During inspiration- what happens to the diaphragm?
Back
Card 4
Front
What happens to the pressure and air movement as the thorax volume increases?
Back
Card 5
Front
During expiration- what happens to the intercostal muscles?
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