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.
A loop of Henle can be found in one of the hundreds of thousands of nephrons contained within the kidneys. The loop of Henle dips down from the nephron into the medulla and then back into the cortex. The loop of Henle is part of a nephron, a tiny tube inside the kidneys that filters solutes. The loop of Henle allows the kidneys to maintain the correct balance of water in the body.
The portion of the nephron called the 'Henle's loop' is shown in the right half of the illustration. It consists of a descending limb that has a down arrow in it and an ascending limb with an up arrow in it.The ascending limb has a thick and a thin segment.ounter-Current Mechanisms. The mechanisms shown here are traditionally called the 'counter-current multiplier' and the 'counter-current exchanger'. The first takes place in the region of the nephron called Henle's loop; the second occurs in a region of the peritubular capillary bed called the 'vasa recta'.