Capillaries are adapted for exchange because their walls are

  1. elastic
  2. one cell thick (endothelium only)
  3. thick and muscular
  4. lined with valves
Answer

B) one cell thick (endothelium only)

Short diffusion distance. AS & A Level Biology · Topic 8 Transport in Mammals · 8.1 The circulatory system

Biology MCQ · More A Level Biology: Transport in mammals MCQs · Practise