B7- Circulation

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  • Created by: chloe
  • Created on: 03-04-13 17:56

What is the double circulatory system?

  • Mammals have one circuit that links the heart and lungs
  • The other circuit links the heart with the rest of the body
  • This system increases the flow of blood to the tissues
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What does blood carry to the muscles?

  • glucose moleclues
  • oxygen
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What does blood carry away from the muslces?

  • Waste products
  • Carbon dioxide
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What do red blood cells do?

  • Transprot oxygen
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What do white blood cells do?

  • Protect agianst disease by fighting infections
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What do platelets do?

  • Clot the blood at points of injury
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What does plasma do?

  • Plasma transports dissolved substances around the body- this includes
  • Hormones
  • Antibodies
  • Nuitrience e.g. water, glucose, amino acids, minerals and vitamins
  • Waste substances e.g. Carbon dioxide and urea
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How have red blood cells adapted?

  • Small size- allowing blood to pass through narrow capillaries
  • Flatterend disk shape- provides large surface area allowing rapid difusion of oxygen
  • Contains haemoglobin- haemoglobin absorbs oxygen in the lungs and releases oxygen in the rest of the body
  • Does not contain a nuclues- increses amount of space for haemoglobin
  • Having a biconcave shape- increases surface area for oxyen exchange
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What are the main features of the heart?

  • Left and Right atria and vebtricles
  • vena cava
  • aorta
  • pulmonary vein
  • pulmonary artery
  • coronary arteries and valves
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Function of valves in the heart and veins

  • Valves prevent backwards flow in the heart and veins
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Use of tissue fluid

  • Tissue fluid is formed in capilary beds and that it assist the exchange of chemicals by deffusion between capilaries and tissues, to incluse oxygen carbon dioxide, glucose and urea.
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