The renal columns of Bertin are extensions of the ...... into the renal medulla.

The $pH$ value of human urine 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.

Given below are two statements:
Statement $I$: At the base of the urinary bladder,there is an inverted triangular area called the trigone.
Statement $II$: Three layers of dartos tunic muscles are present in the wall of the urinary bladder.
In the light of the above two statements,choose the correct option.

Select the correct statements from the following.
$(i)$ Renal papilla is a narrow tip of the medullary pyramid.
(ii) Renal cortex is red-coloured and striated.
(iii) Longitudinal-circular-longitudinal arrangement of smooth muscles is observed in the renal pelvis at its origin.
(iv) Ureter is a long,non-muscular hollow tube that communicates with the renal pelvis at its origin.

Match the following columns:

Column-$I$	Column-$II$
$P$. Structures in renal cortex	$I$. Descending limb of Henle
$Q$. Structures in renal medulla	$II$. Proximal convoluted tubule $(PCT)$
	$III$. Distal convoluted tubule $(DCT)$
	$IV$. Ascending limb of Henle
	$V$. Collecting duct
	$VI$. Duct of Bellini
	$VII$. Afferent arteriole
	$VIII$. Efferent arteriole