other organs

• what are the 4 excretory organs ?

  Kidneys, lungs, skin, and liver.
• what is excretion and why is it important ?excretion is the removal of unwanted substances (excess)

  • excretion is the removal of unwanted WASTE PRODUCTS
  • if not removed, the toxins (that are acidic) will cause enzymes to denature (and mess with the biological processes in the body)
• what does the liver breakdown ?


  • breakdowns haemoglobin (dead RBC, extracts iron) -> bilirubin
  • breakdown excess amino acid (excess protein) -[process of deamination]>> FORMS urea
• what is deamination?

  it is the removal of nitrogen-containing part of 'excess' amino acids to form urea as a product

  
  

  "de" (removal) "amina" (amino acid) "tion" (process)
• what do the lungs excrete?

  CO2 and water vapour
• what does the skin excrete?

  water, sodium chloride and traces of urea

  • NaCl and urea = sticky
• **what is the purpose of sweating?

  • cooling of body (MAIN PURPOSE)
  • in relation to excretion : it helps a little bit (but not very related)
• what is OVERALL liver function ?

  • deamination (produce urea from breakdown of nitrogen-containing part of amino acids)
  • detoxification (remove toxins, i.e. extra amino ACIDS that are acidic and can denature enzymes)
  • produce bile to emulsify fat into droplets
  • store glycogen