Excretory System The excretory system is the body system responsible for removing waste products and maintaining a healthy internal environment in the body. Meaning of Excretion Excretion is the process by which the body removes metabolic wastes and harmful substances produced during body activities. Examples of wastes removed: 1. Urea 2. Excess water 3. Salts 4. Carbon dioxide Organs of the Excretory System Main Organs • Kidneys • Skin • Lungs • Liver Functions of the Excretory System The excretory system performs the following functions: • Removes waste products from the body. • Maintains water balance in the body. • Regulates body salts and minerals. • Helps maintain normal body temperature. • Prevents accumulation of harmful substances. • Maintains healthy blood composition. • Helps maintain homeostasis (stable internal environment). Functions of the Excretory Organs 1. Kidney The kidneys are bean-shaped organs located at the back of the abdomen. Functions of the Kidney • Filt...