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CAIE IGCSE Biology 9.3.4 Artery & Vein Adaptations to Pressure

Practise explaining how arterial and venous walls, lumens and valves suit the blood pressures they carry.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • link thick muscular elastic artery walls to withstanding, stretching and recoiling under high pressure
  • link a relatively narrow arterial lumen to maintaining pressure and a wider venous lumen to low resistance
  • explain that veins have valves to prevent backflow because venous pressure is low

9.3.4—Structure of arteries and veins is question 1

[Maximum number: 4]

Fig. 1.2 shows the pressure of blood flowing through different blood vessels as it travels around the body. (Venules are narrow vessels that connect capillaries to veins.)

Fig. 1.2

Fig. 1.2

Using the information in Fig. 1.2, explain the structural adaptations of arteries and veins.

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