Fix the alveoli statement

Exercise and reference answers

Questions

1. Statement parts

   1. Alveoli
   2. give
   3. a
   4. large
   5. volume
   6. to
   7. surface
   8. area
   9. ratio

   Correction

   surface area — the ratio runs surface area to volume, not the reverse

   Incorrect part

   volume

2. Statement parts

   1. Alveolar
   2. walls
   3. are
   4. ten
   5. cells
   6. thick

   Correction

   one — a single cell thickness keeps the diffusion path short

   Incorrect part

   ten

3. Statement parts

   1. The
   2. alveolar
   3. lining
   4. must
   5. stay
   6. dry

   Correction

   moist — gases must dissolve before they can diffuse

   Incorrect part

   dry

Instructions

One token in each line is wrong. Tap it, then read the correction.