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Unformatted text preview: One of the most important substances removed by nephrons is urea . Urea is formed when cells use protein for energy. It contains nitrogen. Water in, Water Out You drink water every day. You lose water every day in sweat and urine. You need to get rid of as much water as you drink. If you don’t, your body will swell up. How does your body keep the water level in balance? You get thirsty when you sweat out the water and your mouth makes less saliva. When you get thirsty a hormone from the pituitary is released. ADH (antidiuretic hormone) causes the nephrons to return water to the blood. Therefore you do not make as much urine. Some beverages contain a diuretic. diuretic – decreases the amount of water in the blood. Caffeine in drinks causes increased urine. Urinary System Problems bacterial infections kidney disease kidney stones...
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- Fall '10