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The Urinary System
Kidney Model 6 by GreenFlames09 on Flickr

  • The urinary system is the main excretory system in the human body. 
  • The central organs are kidneys 
  • Kidneys work to filter waste, out of blood and produce urine.
  • Blood enters the kidneys through the renal arteries into a medulla. 
  • All the blood vessels lead to a glomerulus, small looping and twisting tube with tiny holes inside it. 
  • Water and some other substances leak out of a glomeruli which are collected  by nephrons and also filtering tubes.

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Kidney Model 7 by GreenFlames09 on Flickr

  • Substances that are used by the human body which includes amino acids, glucose and basically all the water are re-absorbed by blood cells.
  • Substances that are waste including urea, uric acid, excess water and some salts like ammonia and sodium are gathered by small tubes called the collecting tubules. 
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Kidney Model 1 by GreenFlames09 on Flickr

  • From tubules, the urine passes into the kidneys pelvis through the ureters which go into the urinary bladder. 
  • The urine goes out of the body through what is called a urethra when the bladder is full. 
  • Everyday kidneys filter about 50 gallons (190 liters) of blood to produce at least 1-2 quarts (0.9 - 1.9 ) of your urine.
  • Kidneys make less urine when you perspire and more when you drink a lot of liquids. 
  • Besides urine production, your bones will get Vitamin D for bone development, and will also help maintain blood pressure. 
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