Distinguish between: Juxtamedullary and Cortical nephrons.

The structural and functional unit of the human kidney is:

Complete the analogy.
$Renal \text{ } pelvis : \text{ } ureter :: \text{ } Renal \text{ } cortex : \text{ } . . . . . . $

Where are podocytes found?

If one kidney is removed from a human body,then:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Nephrons are of two types: Cortical and Juxta-medullary,based on their relative position in the cortex and medulla.
Reason $R$: Juxta-medullary nephrons have a short loop of Henle,whereas cortical nephrons have a longer loop of Henle.
In the light of the above statements,choose the correct answer from the options given below: