Which of the following enters the hilum of the kidney?

Cortical nephrons are ...... in number compared to juxtamedullary nephrons.

In the kidney of the rabbit,the $Loop$ of $Henle$ is the part of:

Which of the following statements is correct?

The correct arrangement of layers of detrusor muscles in the wall of the urinary bladder is . . . . . . .

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.