How are cast formed?

Casts are cylindrical bodies formed either in the distal convoluted tubules or the collecting ducts of the kidney. Since the walls of the tubule act as a mold for cast formation, the width of the tubule determines the width of the cast.

Explanation:

This is how cast formed.

Casts are cylindrical bodies made by either in the distal convoluted tubules or collecting ducts of the kidney.