Differences between arteries, capillaries and veins

SPM Biology Form 5 Chapter 1



  • Transport bloody away from the heart
  • Transport oxygenated blood (except the pulmonary artery)
  • Thick muscular wall
  • No valves except semilunar valves at the base of the aorta and pulmonary artery
  • Blood flows in pulses under high pressure
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  • Connect arterioles to venules
  • Act as the sites for exchange of substances with the cells
  • Thinnest wall, one cell in thickness
  • No valves
  • No pulses. Pressure lower than arteries but higher than veins
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  • Transport blood to the heart
  • Transport deoxygenated blood (except the pulmonary vein)
  • Thinner wall
  • Valves present to prevent backflow of blood
  • No pulses. Blood flows under lower pressure than arteries
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