In which of the following minimum content of urea is present ?
Hepatic portal vein
Portal vein
Renal vein
Vena cava
It is not in pair.
Draw, neat and labelled diagram of human excretory system.
$A :$ Kidneys are retroperitoneal in position.
$R :$ Kidneys are covered with peritoneum only on ventral surface.
Which of the following is not a function of kidneys