Removing waste products

• 3 ways water is lost from the body:

  • Sweating
  • Exhalation
  • Urination
• What is urea?


  A nitrogenous waste product formed in the liver from the breakdown of excess of amino acids
• Why does carbon dioxide and urea need to be removed?

  They are poisonous waste products to the body
• What ways of water loss controlled and uncontrolled?

  • Exhalation
  • Sweating
• How is carbon dioxide removed from the body?

  Via exhalation
• How is urea removed from the body?

  It is filtered out via the kidneys and passed out the body in urine alongside excess mineral ions and water
• Why is the removal of water, urea and ions tightly regulated?

  To maintain a water balance so cells won't receive too much or too little water via osmosis to function optimally
• What happens to urine if you are dehydrated?

  • Less urine produced
  • Urine becomes more concentrated with urea
• What happens to urine if you are over hydrated?

  • More urine is produced
  • Urine becomes less concentrated with urea