Homeostasis in humans

• How Is blood filtered

  1. Reabsorbing molecules that are needed

  2. Passing molecules that aren't needed into urine
• Too cold

  • Skeletal muscles contract -Shiver
  • Blood vessels narrow (vasoconstriction)
  • Reduces blood flow
  • Conserving heat
• Too hot


  • More sweat
  • Heat transferred to environment
  • Vasodilation
  • Blood vessels widen
  • More blood flow
  • Cooling the body down
• ADH


  Controls volume of urine, released by pituitary gland
• Dialysis (kidney)


  Blood removed and filtered then returned
• Kidney transplant


  Replacing damaged kidney with a new one
• Dialysis DIS


  No overall change In blood glucose levels, Expensive and temporary
• Transplant ADV

  More normal life and cheaper for NHS
• Transplant DIS


  Long wait time, Shortage of kidneys
• Kidneys function

  Remove excess water, salts and urea from the body