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.
1 loop of Henle = U shaped loop that dips into the renal medulla = countercurrent multiplier mechanism occurs here. 2  Descending limb = water reabsorption by osmosis (permeable to water, but not to solute). 3  Bottom of U = most concentrated.4  Ascending limb = salt reabsorption (permeable to salt, but not water). Nephron = functional unit of kidney = glomerulus, Bowman's capsule, proximal tubule, loop of Henle, distal tubule, collecting duct (shared by many nephron). 2  glomerulus = ball of fenestrated capillaries. 3  Bowman's capsule = Cup/Capsule that surrounds the glomerulus.