• The excretory system gets rid of waste and excess water.
  • Although the kidneys are the main organs of excretion, several other organs also excrete wastes.
  • These include the large intestine, liver, skin, and lungs.
  • The amount of water lost in urine is controlled by the kidneys.
  • The roles of the excretary organs other than the kidney are summarized below.
  • The large intestine eliminates solid wastes that remain after the digestion of food.
  • The liver breaks down excess amino acids and toxins in the blood.
  • The lungs exhale water vapor and carbon dioxide.
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