biology 3 chapter 2.1

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The circulatory system and the heart

  • The double circulation system in humans consists of blood vessels, blood and the heart.
  • The heart is organ that pumps blood around the body 
  • Valves prevent backflow of blood 
  • CHAMBERS AND MAIN BLOOD VESSELS
  • VEINS-ATRIA-VENTRICLES-ARTERIES

Keeping the blood flowing

  • Arteries, veins and capillaries are the main type of blood vessels.
  • Substances diffuse between the blood and the cells in the

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