In humans,the kidneys are of which type?

The duct of Bellini opens into the ........ .

Which one of the following correctly explains the function of a specific part of the human nephron?

In some of the nephrons,the loop of Henle is very long and runs deep into the medulla. These nephrons are called:

The vessel leading blood (containing nitrogenous waste) into the Bowman's capsule is known as:

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: