Veins have a wide lumen because

  1. they need to exchange gases
  2. they have no valves
  3. they carry blood at high pressure
  4. the blood is at low pressure, so less resistance helps flow
Answer

D) the blood is at low pressure, so less resistance helps flow

Wide lumens reduce resistance. O Level Biology · Topic 11 Transport in Humans · 11.3 Blood vessels

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