Skin(eccrine glands)-The skin contains sweat(eccrine) glands which the sweat and water is excreted through. Sweat contains salt particles so when the sweat evaporates it helps to regulate the salt concentration in our body, while keeping us cool. Dead body cells are also removed through the skin. Lungs-The lungs are responsible for maintaining life supporting levels of oxygen and releasing (exhaling) carbon dioxide. As respiration occurs and carbon dioxide becomes too plentiful you need to breathe out, which is how the lungs are part of the Excretory System. Liver-The liver secrets bile which breaks down fats that are not needed, which gets rid of unneeded wastes. The liver also takes a toxic gas called ammonia, and changes it to urea which is a harmless chemical. Kidneys and Bladder- Blood passes through the kidneys and delivers unwanted chemicals and a nitrogen rich chemical, urea, which is produced by he liver along with valuable solutes like, glucose, amino acids, ions and vitamins. The kidneys take out all of the bad chemicals and then sends all of the usable solutes back in the blood. The kidneys filter wastes from the blood makes a substance call urine. The urine is then funneled into the bladder by two tubes called the ureters. The bladder excretes about 1.5 liters of urine a day.