The structural and functional unit of the human kidney is:

In humans,both kidneys are located such that:

The $Bellini$ ducts transport which of the following?

Which of the following is correct?

$A:$ The inner wall of Bowman's capsule is lined with specialized cells called podocytes,which have a number of projections.
$R:$ These projections increase the surface area for absorption.

In which of the following is the minimum content of urea present?