What are kidney?

Answer 1

Kidney stones occur when crystals form inside the kidney. They begin microscopically small, and grow over time. Most stones are passed as tiny grains of sand, while others may grow as large as a Golf ball or more, or look like the horns of a moose (staghorn kidney stones).

There are many reasons some people develop kidney stones. Medications can cause the development of some types of stones, as can some illnesses. The congenital condition medullary sponge kidney disease often results in stones formed so frequently that passing them is almost a daily occurrence. Most stones are the result of a metabolic imbalance. Sometimes the metabolic imbalance can be treated, sometimes it can't. A common way to treat patients for recurrent kidney stones is potassium citrate, which makes it less likely for certain stones to form inside the kidney. Some stones are the result of an imbalanced diet which may be easily altered without medication to help.

Answer 2

Kidneys are internal organs whose function is to filter waste (primarily uric acid) out of the blood.

The kidneys are bean-shaped organs, each about the size of a fist. They are located near the middle of the back, just below the rib cage, one on each side of the spine. The kidneys are sophisticated reprocessing machines. Every day, a person's kidneys process about 200 quarts of blood to sift out about 2 quarts of waste products and extra water. The wastes and extra water become urine, which flows to the bladder through tubes called ureters. The bladder stores urine until releasing it through urination.

Wastes in the blood come from the normal breakdown of active tissues, such as muscles, and from food. The body uses food for energy and self-repairs. After the body has taken what it needs from food, wastes are sent to the blood. If the kidneys did not remove them, these wastes would build up in the blood and damage the body.

The actual removal of wastes occurs in tiny units inside the kidneys called nephrons. Each kidney has about a million nephrons. In the nephron, a glomerulus-which is a tiny blood vessel, or capillary-intertwines with a tiny urine-collecting tube called a tubule. The glomerulus acts as a filtering unit, or sieve, and keeps normal proteins and cells in the bloodstream, allowing extra fluid and wastes to pass through. A complicated chemical exchange takes place, as waste materials and water leave the blood and enter the urinary system.

At first, the tubules receive a combination of waste materials and chemicals the body can still use. The kidneys measure out chemicals like sodium, phosphorus, and potassium and release them back to the blood to return to the body. In this way, the kidneys regulate the body's level of these substances. The right balance is necessary for life.

In addition to removing wastes, the kidneys release three important hormones:

- erythropoietin, or EPO, which stimulates the bone marrow to make red blood cells

- renin, which regulates blood pressure

- calcitriol, the active form of vitamin D, which helps maintain calcium for bones and for normal chemical balance in the body
Your kidney is an organ in your body that is located right above your hip bone. You have two kidneys one on your right and one on your left. The kidney filters the blood of wastes then sends the wastes through a tube called the ureter to the bladder.