Columns of Bertini in the kidney of mammals are formed as the extension of

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

Each nephron has two parts, which are

Which of the following blood vessels contains the minimum concentration of urea in the blood?

Select the correct sequence of blood flow in the kidney.

Identify the wrong statements about the human excretory system and choose the option accordingly.
$I.$ Kidneys are reddish-brown and bean-shaped structures.
$II.$ Kidneys are situated between the last thoracic and third lumbar vertebrae.
$III.$ Each kidney of an adult human measures $10-12 \, cm$ in length,$5-7 \, cm$ in width,$2-3 \, cm$ in thickness,and has an average weight of $120-170 \, g$.