Kidneys

  • Kidney is the main organ of human execratory system.
  • The kidneys are two bean-shaped organs, each about the size of a fist. 
  • They are located inside abdominal cavity.
  • The outer part of kidney is called Cortex and inner part of kidney is called Medulla.
  • Inside kidney many tubular and coiled structure present, this is called Nephron.
  • Healthy kidneys filter about a half cup of blood every minute, removing wastes and extra water to make urine.


Structure of Kidney

  • Each kidney is made up of numerous microscopic coiled structures called nephron or uriniferous tubes.
  • There exist about one million nephrons in each kidney.