| Front | Describe how the respiratory surface of mammals is suited to efficient gas exchange. ( 4 marks) |
|---|---|
| Back | many/millions of alveoli give large surface area; lined by thin pavement/simple squamous epithelium for short diffusion distance; moist with (tissue) fluid (reject mucus) to let oxygen dissolve; surrounded by dense capillary network/blood supply for efficient uptake of oxygen/removal of carbon dioxide; elastic to enable (dimension changes during) ventilation movements; |
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