Kidney Facts



  • The kidneys are a pair of bean-shaped organs inside the small of the back.
  • The kidneys are the body’s water control and blood-cleaning plants.
  • The kidneys are high-speed filters that draw off water and important substances from the blood. They let unwanted water and waste substances go.
  • The kidneys filter about 1.3 liters of blood a minute.
  • All the body’s blood flows through the kidneys every ten minutes, so blood is filtered 150 times a day.
  • The kidneys manage to recycle or save every re-useable substance from the blood. They take 85 liters of water and other blood substances from every 1000 liters of blood, but only let out 0.6 liters as urine.
  • The kidneys save nearly all the amino acids and glucose from the blood and 70% of the salt.
  • Blood entering each kidney is filtered through a million or more filtration units called nephrons.
  • Each nephron is an incredibly intricate network of little pipes called convoluted tubules, wrapped around countless tiny capillaries. Useful blood substances are filtered into the tubules, and then re-absorbed back into the blood in the capillaries.
  • Blood enters each nephron through a little cup called the Bowman’s capsule via a bundle of capillaries.