Answer:
- Kidneys: The main organ of the excretory system. They filter
wastes and poisons out of the blood. Your entire blood supply passes
through the kidneys about once every 30 minutes. The waste
removed here is urine, which is made up of water, urea, and
salts. Nephrons are small filtering units in the kidney
- Lungs: Release carbon dioxide and water from the process of
respiration.
- Liver: The liver stores sugar until it is needed in the blood. Amino
acids release nitrogen when they are changed into sugars. Nitrogen is
changed by the liver into urea. Urea is a significant substance in urine
that is released from the body through the urethra.
- Skin: The skin releases urea, water and salt from the body
through sweat. Perspiration also helps to cool the body.