Arteriole - Small artery, calciferol - Active form of vitamin D, secreted by the kidney, calyx - Cup-like collecting region of the renal pelvis. The term comes from Greek, kalux, meaning a cup or case surrounding a flower bud., creatinine - Nitrogenous waste excreted in urine. Creatinine is a product of muscle metabolism. , electrolyte - Chemical element that carries an electrical charge when dissolved in water. , erythropoietin (EPO) - Hormone secreted by the kidney to stimulate the production of red blood cells. , Filtration - Process whereby some substances, but not all pass through a filter, glomerular capsule - Enclosing structure surrounding each glomerulus, aka Bowman capsule and collects the material that is filtered from the blood through the walls of the glomerulus. , glomerulus - Tiny ball of capillaries in the kidney, hilum - Depression in the kidney where blood vessels and nerves enter and leave , kidney - One of two bean shaped organs on either side of the backbone in the lumbar region. It filters nitrogenous wastes from the bloodstream to form urine, meatus - opening or canal, medulla - inner region of an organ. The renal medulla is the inner region of the kidney, nephron - Functional unit of the kidney. It is the combination of the glomerulus and renal tubule where filtration, reabsorption, and secretion take place in the kidney., Nitrogenous Waste - Substance containing nitrogen and excreted in urine. , Potassium K+ - Electrolyte regulated by the kidney so that a proper concentration is maintained within the blood. , reabosorbtion - Process whereby renal tubules return materials necessary to the body back into the bloodstream, trigone - Triangular area in the urinary bladder, urination (voiding) - Process of expelling urine, aka micturition , renal pelvis - Central collecting region in the kidney,

Urinary System

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