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.