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System Diagram Distance Surface Area Concn Gradient Additional
Capillary walls one cell Many alveoli make up Breathing in and out RBCs lots of
thick very large surface removes CO2 rich air, haemoglobin to carry
Alveolar walls one cell area 160m2 approx brings in O2 rich air lots of oxygen
Lungs…

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Lamellae walls only one Lots of filaments on Constant flow of fresh Tips of filaments
cell thick stacks and lots of water (by movement or overlap ­ slow down
Capillary walls only one lamellae on filaments ventilation) ­ means 02 flow of water ­ more
Fish cell thick gives very…

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