Biology 0610 · IGCSE · Blood vessels

Blood vessels — practice question

The diagram illustrates a cross-section of a human vein. What function does the part marked X carry out?

  • Ato make sure the blood flows to the heart
  • Bto make sure the blood flows to the kidneys
  • Cto make sure the blood flows to the brain
  • Dto make sure the blood flows to the lungs

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