circulatory system

• what does the circulatory system transport?


  food and oxygen to every cell in the body
• what are the main components in the circulatory system?


  • blood
  • blood vessels
  • heart
• what happens to the blood after it is oxygenated to the blood?


  it returns to the heart to be pumped by the body
• what is the function of the left ventricle?


  pumps oxygenated blood to the body
• what is a double circulatory system?


  A circulatory system in which blood passes through the heart twice in one complete circuit of the body.
• what happens to the blood after it takes in oxygen to the lungs?


  it returns to the heart
• what prevents blood from flowing backwards in the heart?

  valves
• what are valves?


  Mechanical devices that control the flow of fluids or gases.
• what are some other types of blood components?


  • platelets
  • red blood cells
  • white blood cells
  • plasma
• what are platelets?


  help to clot your blood
• what are red blood cells?


  carries oxygen
• what is the function of white blood cells?


  helps fight off infection as it produces antibodies, antitoxins and engulfs pathogens
• what is the role of plasma?


  liquid which carries everything in the blood
• what are the main blood vessels?

  • arteries
  • veins
  • capillaries
• what is the role of arteries?


  takes blood away from the heart
• what are the characteristics of arteries?


  • thick muscle and elastic layer
  • small lumen
  • carryies blood under high pressure
• artery diagram

  A) small lumen

  B) thick wall

  C) elastic wall

  D) muscle

  
• what is the function of veins?


  takes blood back to the heart
• what are the characteristics of veins?


  • thin muscle and elastic layer
  • larger lumen
  • carryies blood under low pressure
  • so has valves to stop backflow
• vein diagram

  A) thin wall

  B) large lumen

  C) valves

  
• what is the function of the capillaries?


  exchange of substances to cells
• what are characteristics of capillaries?


  • one cell thick for short diffusion pathway
  • large lumen
  • known as beds