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Excretory System Fun Facts 1) The average person pees about 3000 times a year. 2) Most people, on average, would breathe about 6,286,920 times in their lifetime. 3) The human intestine is usually 27 feet long and 10 inches. (8.5 meters long) 4) The average adult bladder can hold 16-24 ounces of urine. 5) A liver would be about 3 pounds in an average human. 6) The liver is rubbery to touch. 7) One kidney (aproximately) measures to about 4 inches. 8) The average person's lung measures about 12 inches. 9) An average person sheds from about 30000 to 40000 skin cells every minute. 10) The average person poops about 305 pounds a year. More Fun Facts 1) 2) 3) 4) 5) 6) 7) 8) 9) The bladder is as big as your brain. The Kidneys are half the size as your bladder. An estimated 7,850,000,000,000 gallons of fluid passes through the bladder and out through the urethra in the average person's lifetime. The Ureter is the size of a spaghetti noodle. The liver produces 6,500 oz. of bile in a persons lifetime As you urinate, your bladder starts to shrink only to grow larger when it fills with urine. A sign that you drank too much water is that your urine is a medium cloudy yellow. The kidneys have as much as 6,487,000,000 nephrons (things that filter the blood) inside of them. The Vein that leads to you kidney's is the biggest in the body. The Human Excretory System Notes The function of the excretory system is to excrete (get rid of) wastes that are not helpful to the body. Waste • Wastes that are removed include carbon dioxide, water, salt, urea and uric acid. • All excreted wastes travel at some time in the blood. Structures of the Excretory System 1. Skin 2. Lungs 3. Liver 4. Large intestine 5. Urinary System Skin Wastes such as excess water, salt, urea and uric acid are removed from the body in sweat. Lungs Excess carbon dioxide waste is removed from the body when we exhale. CO2 Liver The liver is a part of what other system? The digestive system Liver The liver has many functions, including (but not limited to): 1. to produce substances that break down fats 2. produce urea (the main substance of urine) 3. make certain amino acids (the building blocks of proteins) 4. filter harmful substances from the blood (such as alcohol) 5. The liver is also responsible for producing cholesterol. It produces about 80% of the cholesterol in your body. The Liver and Waste • The liver produces urea and uric acid as a by-product of the breakdown of proteins. • Urea and uric acid are sent to the kidneys to be processed. Liver Large Intestine • The large intestine removes solid, undigested food from the body after it passes through the digestive system. • Waste is stored in rectum until it is excreted from the body as solid waste. The urinary system • The kidneys filter the blood to form urine, which is excess water, salt, urea and uric acid.