Blood Vessels

• Name the 3 blood vessels

  arteries, veins, capillaries
• What do arteries do?

  Take blood away from heart
• How are arteries adapted for their function?

  Pumps blood at high pressure, thick muscle and elastic tissue walls, small lumen
• What is a small artery called?

  Arteriole
• What is the function of the veins?

  carry blood back to the heart
• How are veins adapted for their function?

  Pumps blood at low pressure, thin muscle and elastic tissue walls, large lumen, contain valves
• What do valves do?

  Prevent the back flow of blood
• What are small veins called?

  Venules
• State the adaptions of the capillery

  Only 1 cell thick (increased rate of diffusion), permeable walls (substances can diffuse in and out quickly), can carry blood close to every cell
• What is the order of the blood vessels?

  arteries, arterioles, capillaries, venules, veins