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Cambridge IGCSE Biology practice

Paper 3 structured question: Blood vessels

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Blood vessels

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Paper 3Theory (Core)2 marks

Blood vessels differ in lumen size and presence of valves.

Description

Blood vessel features

Arteries have a narrow lumen and no valves. Veins have a wide lumen and valves. Capillaries have a very narrow lumen and no valves.

  1. a

    Identify which blood vessels have valves and explain their function.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Blood vessels

Paper 3Theory (Core)2 marks

Diagram Description

Diagram of blood vessels

A diagram shows three types of blood vessels: artery, vein, and capillary. The artery has a thick wall and narrow lumen, the vein has a thinner wall and wider lumen with valves, and the capillary has a very thin wall and very narrow lumen.

CharacteristicArteryVeinCapillary
Wall thicknessThickThinOne cell thick
Lumen sizeNarrowWideVery narrow
Valves presentNoYesNo
  1. a

    Describe the differences in wall thickness between arteries, veins, and capillaries.

    Aim for approximately 2 distinct marking points.

    [2]