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What takes place when we inhale and exhale ?

plss. i nedd this now :)
2. When you inhale
- the intercostal muscles contract, expanding the ribcage
- the diaphragm contracts, pulling downwards to increase volume of the chest
- pressure inside the chest is lowered and air is sucked into the lungs
When you exhale
- the intercostal muscles relax, ribcage drops inwards and outwards
- the diaphragm relaxes, moving back upwards to decrease volume of the chest
- pressure inside the chest increases and air is forced out ..
it takes place oxygen
the exchange of oxygen and carbon dioxide takes place


Gas exchange takes place.
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