Kidneys with a complete parenchymal bridge in the sinus, which is diagnostic for a duplex collecting system, were also excluded from the study. The children were between 1 month and 18 years old (mean age, 6.1 Â± 5.9 years).he objective of our study was to develop, by use of ultrasound, nomograms of renal parenchymal thickness, medullary pyramid thickness (height), renal length, and the ratio of medullary pyramid thickness to parenchymal thickness in healthy children.
erythropoietin. a glycoprotein hormone secreted by the kidney in the adult and by the liver in the fetus, which acts on stem cells of the bone marrow to stimulate red blood cell production (erythropoiesis).
Aldosterone is a hormone produced by the adrenal glands located just above each kidney. Aldosterone helps to control the amount of fluid in the body by affecting how much salt and water the kidney retains or excretes.The adrenal glands produce aldosterone in response to another hormone called renin.Renin is produced by specialised cells in the kidney that detect when the body is dehydrated; renin released by the kidney signals the adrenal glands to release aldosterone.ldosterone helps to control the amount of fluid in the body by affecting how much salt and water the kidney retains or excretes. The adrenal glands produce aldosterone in response to another hormone called renin.