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Kidneys-

 Kidneys are bean-shaped organs located on either side of the vertebral column
just above the waist.
 They work like filters. Blood, laden with waste materials enters the kidney.
 The waste is filtered from the blood and the purified blood is sent to the normal
circulation.
 The waste, along with water, is transferred to the urinary bladder through the
ureters.
 The content of the ureter is called urine. Urine contains 95% water, 2.5% urea
and 2.5% other wastes.
 Each kidney consists of a large number of coiled tubes called nephrons, which
are known as the functional unit of kidney.

NEPHRONS
• Filtering units of kidney.
• Filter out excess salts, urea and water from the blood.
• Glucose, amino acids, salts are reabsorbed in the kidney.