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Excretory System Removes wastes from the body. Excretion: The process of removing wastes and excess products from the body. Three systems are involved in excretion: 1. Respiratory – Lungs remove carbon dioxide. 2. Integumentary – Skin removes waste and water when you sweat. 3. Urinary – Kidneys remove wastes from blood. Urinary System Removes waste products from the blood. Urinary system is made up of: • Kidneys • Ureter • Bladder • Urethra Kidneys • Two kidneys constantly clean the blood • Nephrons are found inside the kidneys. • Nephrons are filters that remove harmful substances from the body. • Urea is one of the most important wastes removed from the body. • Urea is produced when proteins are used for energy. How Kidneys Filter Blood 1. Blood is brought to each kidney by an artery. 2. Smaller blood vessels take blood to nephrons. 3. Water and other substances are forced out of blood vessels and into the nephrons. 4. Most of the water and some nutrients are returned to the blood vessels after traveling through the nephrons. 5. The cleaned blood leaves each kidney through a vein. Waste Removal 6. A concentrated mixture of waste materials, urine, is left behind in the nephrons. 7. The urine leaves each kidney through a slender tube, ureter, that takes it to the urinary bladder. 8. Urine is stored in the urinary bladder. 9. Urine leaves the body through another tube called the urethra. Urination is the process of expelling (removing) urine from the body. Vein Artery Kidney Ureter Bladder Muscle Urethra