| Front | Describe the features of the lungs that make them effective organs for the exchange of gases. (5) |
|---|---|
| Back | Lots of alveoli produce a large surface area The alveoli are 1 cell thick and therefore thin Good blood supply to the alveoli to carry dissolved gases Contains elastin tissue to prevent alveoli from bursting and stretches and recoils to expel air during expiration. |
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