Which parts of the circulatory system have thin walls, allowing diffusion of gasses?
  • Arteries
  • Veins
  • Capillaries
  • Atria and ventricles
Arteries carry blood in which direction?
  • Towards the heart
  • From atria to venticles
  • Away from the heart
  • Away from the organs
Valves preventing the backflow of blood and are found in which of the following?
  • In the arteries
  • In the capillaries
  • In the liver
  • In the veins
Platelets are involved in blood...
  • flow
  • renewal
  • clotting
  • oxygen levels
Which of the following is another name for a red blood cell?
  • Erythrocyte
  • Leucocyte
  • Platelet
  • Antibody
Red blood cells have a special shape to allow maximum...
  • surface area for diffusion
  • volume for water
  • density for floating
  • area and volume
Blood plasma is...
  • solid
  • liquid
  • gas
  • inert
Plasma carries carbon dioxide away from the...
  • lungs
  • organs
  • platelets
  • valves
What are the smallest blood vessels, requiring a microscope in order to be seen?
  • Arteries
  • Veins
  • Capillaries
  • Lymphatic vessels
Most arteries carry blood which is...
  • deoxygenated
  • red
  • blue
  • oxygenated
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