B3 Revision part3

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  • Created by: mbeales
  • Created on: 24-04-15 12:41
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  • Controlling Blood Sugar, Glucose (Diabetes)
    • The blood glucose concentration of the body is monitored and controlled by the pancreas.The pancreas produces the hormone insulin, which allows the glucose to move from the blood into the cells.
    • A second hormone, glucagon is produced in the pancreas when blood level glucose levels fall. This causes glycogen to be converted into glucose and be released into the blood.
    • Type 1 diabetes is a disease in which a person's blood glucose concentration is too high because they do not produce enough insulin (often due to genetics).
  • Global Warming
    • CO2 is removed from oceans and lakes. (carbon sinks)
  • Waste may pollute water with sewage or fertiliser, air with gases such as sulphur dioxide (acid rain) and land with herbicides and pesticides which are washed  into waterways.
  • Iron Lungs/ Ventilators
  • Blood enters the atria of the heart. The atria contracts and forces the blood into the ventricles. The ventricles then contract and force blood out of the heart.
  • Artificial Hearts are a quick short term replacement if transplant is not available.They can result in blood clotting.
  • Stents can be used to stop arteries becoming narrow (metal grids inserted and then expanded)
  • The Heart
  • The VENA CAVA carries deoxygenated blood from the body.
  • RIGHT ATRIUM
  • PULMONARY VEIN (back to heart)
  • LEFT ATRIUM
  • LEFT VEhttp://www.bbc.co.uk/staticarchive/f55714112a7e235b72badb579fbf299df173efd4.gifNTRICLE
  • air is forced into the lungs through a tube which is inserted into the trachea. As the ventilator pumps air in, the lungs inflate.
  • GLUCOSE (detects levels)
  • GLYCOGEN (hormone produced)
  • INSULIN (high)
  • GLUCAGON (low)

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