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alveoli function
get oxygen into bloodstream
alveoli structure
large surface area, moist surface, short diffusion pathway of one cell thick to increase rate of diffusion
gas exchange pathway
breathe in through oral or nasal cavities, through trachea, into bronchi and through to alveoli
similarities between gills
large surface area, blood vessels surrounding
haemoglobin function
pigment in red blood cells with high level of iron which has high affinity for oxygen
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