Arteries

• Carry blood at?high pressure away from the heart
• Carry?oxygenated?blood (other than the pulmonary artery)
• Have?thick muscular walls?containing elastic fibres
• Have a?narrow lumen
• Speed of flow is?fast

Veins

• Carry blood at?low pressure towards the heart
• Carry?deoxygenated?blood (other than the pulmonary vein)
• Have?thin?walls
• Have a?large lumen
• Contain?valves
• Speed of flow is?slow

Comparing arteries and veins

Capillaries

• Carry blood at?low pressure?within tissues
• Carry?both oxygenated and deoxygenated blood
• Have walls that are?one cell thick
• Have ‘leaky’ walls
• Speed of flow is?slow

Structure of a capillary

轉載自savemyexams