Glomerulus is formed by

Provide definitions/explanations for the following terms:
$(1)$ Column of Bertini
$(2)$ Excretory unit (nephron)

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

Bowman's capsule and glomerulus together constitute

Describe the human excretory system.

Read the following four statements $(A-D)$ and select the correct ones:
$(A)$ The medulla of the kidney is divided into a few conical masses projecting into the calyces.
$(B)$ The cortex of the kidney extends in between the medullary pyramids as renal columns called columns of Bertini.
$(C)$ The kidneys are situated in the ventral part of the thoracic region in the human body.
$(D)$ Each kidney of an adult human measures $10-12 \ cm$ in length,$5-7 \ cm$ in width,$2-3 \ cm$ in thickness,with an average weight of $120-170 \ gm$.