1 Strenuous exercise, such as running a marathon, can also cause blood in the urine. 2  White blood cells may be a sign of infection or kidney disease. 3  Casts. 4  Some types of kidney disease can cause plugs of material (called casts) to form in tiny tubes in the kidneys.
Top 10 facts about the world. The loop of Henle is a part of a nephron, a tiny tube inside the kidneys that filters solutes. Each kidney contains hundreds of thousands of individual nephrons, which pass between the cortex of the kidneys and the medulla, connecting to collecting ducts which route urine to the ureter so that it can be expressed.
F: Cortex. The cortex is the outer part of the kidney. This is where blood is filtered. We call this process âultra-filtrationâ or âhigh pressure filtrationâ because it only works if the blood entering the kidney in the renal artery is at high pressure.ere is a diagram of the kidney showing a nephron broken up into six parts. Each part has a specific function. You can click on a letter to find out what that part does. Here is a diagram of a nephron put back together again. You can click on a green or red area to find out what happens there.