Final answer:
When extracellular protein is present in the urine, it can indicate a damaged glomerulus. This condition, called proteinuria, can cause the presence of blood cells in urine.
Step-by-step explanation:
When extracellular protein is present in the urine, it is often a sign of a damaged glomerulus allowing protein to leak into the filtrate. This condition, known as proteinuria, can also cause the presence of blood cells in urine, including red blood cells and white blood cells.
The presence of blood cells in the urine, along with protein, can be observed in conditions such as nephritis, trauma, tuberculosis of the kidney, and kidney stones.