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High C02 levels in blood detected by
medulla oblongata (in the brain)
what does the brain send to the lungs
electrical impulse as ions (through motor nerves)
diaphragm muscles...
contracts and diaphragm flattens
intercostal muscles.....
contract and ribcage moves up and out
lungs...
volume increase
lung pressure..
is lower than external surroundings
... is taken from surrounding environment
air