The thoracic cavity must increase. This happens because the intercostal muscles and the diaphragm contract. Rib cage moves up and out and diaphragm flattens to increase the space. This decreases the air pressure and causes air to rush in from outside
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What happens when we breathe out?
The intercostal muscles and diaphragm relax, returning to their starting position, which decreases the size of the thoracic cavity. The decreased space and increased air pressure in the lungs forces air out
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In the alveoli carbon dioxide...
passes out of the blood
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During exercise working muscles need more...
oxygen
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During anaerobic exercise there is a build up of..
Lactic Acid
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Insufficient oxygen supplies are available during..
Strenuous Exercise
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What is Tidal Volume?
Amount of air you breathe in/out with each breathe
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What is Inspiratory Capacity?
Max. amount you can breathe in (after a normal breathe out)
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What is Expiratory Reserve Volume?
After a normal breath out, how much extra you can breathe out.
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What is Vital Capacity?
Max amount of air you could possibly breathe in/out in one breath.
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What is Residual Volume?
Amount o air left in your lungs after you have breathed out as much as possible
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