Describe the structure of a human kidney with the help of a labelled diagram.

(N/A) The internal structure of the human kidney can be described as follows:
$1$. External Features: The kidney is a bean-shaped organ. On its concave surface,there is a notch called the hilum,through which the renal artery,renal vein,and ureter enter or exit the kidney.
$2$. Renal Pelvis: Inner to the hilum is a broad,funnel-shaped space called the renal pelvis,with projections called calyces.
$3$. Capsule: The outer layer of the kidney is covered by a tough,fibrous connective tissue capsule.
$4$. Internal Zones: Inside the kidney,there are two distinct zones: an outer cortex and an inner medulla.
$5$. Medullary Pyramids: The medulla is divided into several conical masses known as medullary pyramids,which project into the calyces.
$6$. Renal Columns: The cortex extends in between the medullary pyramids as renal columns,which are known as the columns of Bertini.
$7$. Nephrons: Each kidney contains nearly one million complex tubular structures called nephrons,which are the functional units of the kidney.