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Sort the exchange surfaces

Exercise and reference answers

Left
Alveolus
Items
  1. Region
    Alveolus
    Item
    Holds air
  2. Region
    Alveolus
    Item
    Lined with fluid
  3. Region
    Capillary
    Item
    Carries blood
  4. Region
    Capillary
    Item
    Holds red cells
  5. Region
    both
    Item
    Wall one cell
  6. Region
    both
    Item
    Gases diffuse
Right
Capillary
Instructions
Tap an item, then the zone it belongs to. Some belong to both.
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