The process which is the breaking down of macromolecules is called Hydrolysis (the breaking of a bond in a molecule using water) This means that polymers are broken down into monomers. This literally means ‘Split water’ and a reaction between an ion and the water molecule is used during used during the breakdown.
The aveolus is surrounded by capillaries. So capillaries carry deoxygenated blood to the alveolus where the oxygen from the alveolus diffuses into the blood in the capillaries. The deoxygenated blood is now oxygenated and is carried out of the lung via capillaries that then merge into the pulmonary vein.
In other words, alveolus does not have oxygenated blood it just puts oxygen into the deoxygenated blood hat this brought in.
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