Biology (NTSE/Olympiad)  

4. Excretion

Excretion In Human Being

Excretion In Human Being
A pair of kidney is the main excretory organ in human.
Structure and Function of Kidney in Human :
There are two bean shaped, dark red coloured kidney placed just below the stomach, one on each side of the mid dorsal line.
The depression is called hilus from where the ureter originates and the renal artery and renal vein go in and out here.

Ureter entering through hilus expands. Medula on inner side has cone like structure called renal pyramids. Each kidney contains about one million nephrons. The functional unit of the kidney is the nephron.

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