https://en.wikipedia.org/wiki/Gas_exchange
http://www.bbc.co.uk/bitesize/ks3/science/organisms_behaviour_health/life_processes/revision/5/
http://www.bbc.co.uk/schools/gcsebitesize/science/triple_aqa/movement_of_molecules/gaseous_exchange_lungs/revision/1/
https://www.boundless.com/biology/textbooks/boundless-biology-textbook/the-respiratory-system-39/gas-exchange-across-respiratory-surfaces-220/basic-principles-of-gas-exchange-833-12078/
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