The main excretory organs in humans are the kidneys, but the lungs, skin, and liver also help in removing wastes from the body.

Excretory Organs and Functions

• Kidneys: Filter urea, uric acid, and excess salts → form urine.
• Lungs: Expel CO₂ and water vapour.
• Skin: Removes sweat (water, salts, urea).
• Liver: Converts toxic ammonia into urea before sending it to kidneys.