How Do the Kidneys Function as a Part of the Excretory

Question

How do the kidneys function as a part of the excretory system?
A) By removing bilirubin
B) By removing carbon dioxide
C) By removing salts, lactic acid, and urea
D) By removing nitrogenous wastes

Accepted Answer

The organs of the excretory system remove waste in the following ways: The skin removes some salts, lactic acid, and urea with sweat; the lungs remove carbon dioxide with every humidified, expired breath; the liver removes bilirubin by putting it in bile; and the kidneys remove nitrogenous wastes (wastes containing nitrogen), excess minerals, bilirubin, and excess hydrogen ions by producing urine.