Biology 9700 · AS & A Level · The circulatory system

The circulatory system — practice question

Which row gives the correct description of an artery?

  • Ainner layer: smooth layer of endodermis cells; middle layer: collagen, elastic fibres and smooth muscle; outer layer: collagen only
  • Binner layer: smooth layer of endodermis cells; middle layer: elastic fibres and smooth muscle only; outer layer: collagen and elastic fibres
  • Cinner layer: smooth layer of squamous cells; middle layer: collagen, elastic fibres and smooth muscle; outer layer: collagen and elastic fibres
  • Dinner layer: smooth layer of squamous cells; middle layer: elastic fibres and smooth muscle only; outer layer: collagen only

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