Excretion - Kidneys- Nephron-Human excretory system
EXCRETION Excretion is the elimination of wastes produced by the body. Excretory systems regulate the chemical composition of body fluids by removing metabolic wastes and retaining the proper amounts of water, salts, and nutrients.Components of this system in vertebrates include the, liver,lungs,kidneys,and skin. Liver: The liver breaks down excess amino acids and produces urea. Liver breakdowns hemoglobin into bilirubin. is excreted with the bile into the intestine and expelled with the faeces. Lungs: The lungs supply the body with oxygen, but they are also excretory organs because they get rid of carbon dioxide. Kidneys: The kidneys remove urea and other nitrogenous waste from the blood. They also expel excess water, salts,hormones and drugs. Skin: skin is the larges organ of the body. Sweat consists of water, with sodium chloride and traces of urea dissolved in i...