Definitions: K
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Kidney - either of the two organs in the lumbar region that filter the blood, excreting the fluid end-products of body metabolism in the form of urine, and regulating the concentrations of hydrogen, sodium, potassium, phosphate, and other body chemistry. They also regulate the amount of fluid retained in the body which has a direct effect on blood pressure.
Kidney Disease - renal failure (kidney failure) is a situation in which the kidneys fail to function adequately. It is divided in acute and chronic forms; either form may be due to a large number of other medical problems. It is typically detected by an elevated serum creatinine. When the kidneys malfunction, problems frequently encountered are abnormal fluid levels in the body, uncontrolled acid levels, abnormal levels of potassium, calcium, phosphate, hematuria and (in the longer term) anemia. Long-term kidney problems have significant repercussions on other diseases.
Knead - a grasping, rolling, and pressing movement, as is used in massaging the muscles.
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Sources:
http://www.thefreedictionary.com/
http://www.webmd.com/
