The JGA (Juxta Glomerular Apparatus) is a special sensitive region formed by cellular modifications in

$\_\_\_\_$ related to the same nephron.

In frog, the Renal portal system is a special venous connection that acts to link:

Which of the following diagrams is correct with regard to the proximal $(P)$ and distal $(D)$ tubule of the Nephron.

Given below are two statements:

Statements I: Concentrated urine is formed due to counter current mechanism in nephron.

Statement II: Counter current mechanism helps to maintain osmotic gradient in the medullary interstitium.

In the light of the above statements, choose the most appropriate answer from the options given below.