$A$ man excretes about ........ urine in $24$ hours.

Podocytes are located in the ........ .

How many nephrons are present in the human body?

Choose the incorrect sentence$(s)$.
$(I)$ Malpighian corpuscles,$PCT$ and $DCT$ of the nephron are situated in the medulla of the kidney.
$(II)$ The loop of Henle dips into the medulla.
$(III)$ In juxtamedullary nephrons,the loop of Henle is too short and extends very little into the medulla.
$(IV)$ Vasa recta is absent or highly reduced in cortical nephrons.

The $pH$ value of human urine is:

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