The lungs are effective gas exchange organs due to numerous alveoli providing a large surface area; alveoli are one cell thick with good blood supply to maintain a concentration gradient; and elastic tissue allows alveoli to stretch and recoil for expiration.
Os pulmões são órgãos eficazes para a troca gasosa devido ao grande número de alvéolos, que proporcionam uma grande área de superfície; os alvéolos têm uma espessura de uma célula e um bom suprimento de sangue para manter o gradiente de concentração; e o tecido elástico permite que os alvéolos arrefeçam e recoolem para a expiração.
| 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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