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Creatinine itself is produced [5] via a biological system involving creatine, phosphocreatine (also known as creatine phosphate), and adenosine triphosphate (ATP, the body's immediate energy supply). Creatine is synthesized primarily in the liver by methylation of glycocyamine (guanidino acetate, synthesized in the kidney from the amino acids ...
reabsorption (thick ascending) via passive transport: reabsorption in response to PTH and ↑ reabsorption with Thiazide Diuretics. – Magnesium: Calcium and magnesium compete, and an excess of one can lead to excretion of the other. reabsorption: reabsorption (thick ascending) reabsorption – Phosphate: Excreted as titratable acid.
This filtrate then flows along the length of the nephron, which is a tubular structure lined by a single layer of specialized cells and surrounded by capillaries. The major functions of these lining cells are the reabsorption of water and small molecules from the filtrate into the blood, and the secretion of wastes from the blood into the urine.
The collecting duct system of the kidney consists of a series of tubules and ducts that physically connect nephrons to a minor calyx or directly to the renal pelvis.The collecting duct participates in electrolyte and fluid balance through reabsorption and excretion, processes regulated by the hormones aldosterone and vasopressin (antidiuretic hormone).
Problems with creatinine (varying muscle mass, recent meat ingestion (much less dependent on the diet than urea), etc.) have led to evaluation of alternative agents for estimation of GFR. One of these is cystatin C, a ubiquitous protein secreted by most cells in the body (it is an inhibitor of cysteine protease). [14]
Examples of substances reabsorbed are solute-free water, sodium, bicarbonate, glucose, and amino acids. Examples of substances secreted are hydrogen, ammonium, potassium and uric acid. The nephron is the structural and functional unit of the kidney. Each adult human kidney contains around 1 million nephrons, while a mouse kidney contains only ...
Renal protein reabsorption is the part of renal physiology that deals with the retrieval of filtered proteins, preventing them from disappearing from the body through the urine. Almost all reabsorption takes place in the proximal tubule. Only ~1% [1] is left in the final urine. The proteins cross the apical membrane by endocytosis.
The final stage of urine oxidation occurs in the collecting ducts, where H + ions are secreted with the involvement of ATP, and NH 3 is transported from the interstitium and secreted into the urine, where NH 3 is oxidized by H + to form NH 4 +. [151] By regulating HCO 3 − reabsorption and H + secretion, the kidneys help maintain blood pH ...