Which of the following organs is primarily responsible for excretion in humans?

Which of the following organs is primarily responsible for excretion in humans?

  1. Liver
  2. Lungs
  3. Kidneys ✓
  4. Pancreas

Explanation

The kidneys are the main organs that remove liquid waste from the body through urine. Each kidney filters blood constantly to remove toxins, excess water, and waste products. The kidneys process about 200 liters of blood every day.

Inside each kidney are millions of tiny filters called nephrons. These nephrons clean the blood and make urine from waste materials. The urine then travels to the bladder where it is stored until you urinate.

The liver breaks down toxins but does not excrete them directly from the body. Lungs remove carbon dioxide gas, which is excretion, but this is not their primary function. The pancreas makes digestive enzymes and insulin, not waste removal.