Urinary Acid Excretion
Urinary Acid Excretion - Related Videos
01:11
One-Compartment Open Model: Urinary Excretion Data and Determination of k
0 Views •
2025
The one-compartment open model leverages urinary excretion data to estimate renal clearance, which gauges the kidney's capacity to expel a drug. This method offers several benefits, including directly measuring drug elimination and assessing the kidney's contribution to overall drug clearance. However, this approach has limitations. It assumes sole renal excretion of the drug, which is not true for all drugs. Accurate urinary excretion and plasma drug concentration measurement can also be...
02:12
What Are Osmoregulation and Excretion?
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2025
Organisms must keep bodily fluids at a constant temperature and pH while maintaining specific solute concentrations in order to support life functions. Osmoregulation is the process that balances solute and water levels. Osmosis is the tendency of water to move from solutions with lower ion concentrations, or osmolarities, to those with higher ion concentrations. Osmosis occurs in response to differences in the molecular concentrations of solutions separated by a semipermeable membrane.
03:47
Methylene Blue Dye Injection in Mouse Embryonic Urinary Tract: A Method To Assess the Congenital Obstruction in the Urinary Tract
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2025
In this video, we administer methylene blue dye injection into the urinary tract of a perinatal embryonic mouse to assess congenital anomalies related to urinary tract obstruction.
05:05
A Modified Precipitation Method to Isolate Urinary Exosomes
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Cited by 32 •
2015
This manuscript describes a protocol for isolating exosomes from human urine using a modified precipitation technique.
01:15
Renal Drug Excretion: Overview
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2025
As primary excretory organs, the kidneys maintain homeostasis by removing waste substances from the bloodstream. They comprise over a million units called nephrons, which serve as the kidney's functional units. A nephron consists of two primary structures: the renal corpuscle and the renal tubule. The renal corpuscle contains the glomerulus, a network of capillaries where the first step of renal excretion, glomerular filtration, occurs. Blood pressure forces water, ions, and small molecules out...
FAQs
Bicarbonate reabsorption is essential because filtered bicarbonate represents an important base that must be conserved while acids are removed. During urinary acid excretion, the kidney therefore coordinates recovery of bicarbonate with hydrogen-ion secretion rather than treating acid removal as an isolated event. This preserves the buffering capacity needed for stable systemic pH.
Phosphate and ammonia act as urinary buffers for hydrogen ions secreted into tubular fluid. Phosphate permits acid to leave as titratable acid, while ammonia supports excretion as ammonium. These buffering systems allow the kidney to remove more nonvolatile acid without leaving all secreted hydrogen ions unbuffered in the tubular fluid.
The available buffering substance in tubular fluid determines the form in which acid is excreted. Hydrogen ions associated with phosphate contribute to titratable acid, whereas interaction with ammonia supports ammonium excretion. Considering both pathways is important because urinary acid removal depends on the coordinated use of these distinct buffers.
Assessment can encompass several linked renal functions: reabsorption of filtered bicarbonate, secretion of hydrogen ions, and buffering by phosphate and ammonia. It also considers the resulting loss of titratable acids and ammonium in urine. Examining these components together provides a more informative view of renal acid-base physiology than focusing on a single transport step.
Measuring urinary acid excretion supports investigations of renal physiology and the kidney’s contribution to systemic acid-base balance. It can also help evaluate disturbances associated with impaired kidney function or metabolic acidosis. These applications make the measurement relevant both to basic studies of tubular processes and to research examining altered acid handling.
The kidneys adjust bicarbonate handling, hydrogen-ion secretion, and tubular buffering in response to acid produced by metabolism and to dietary inputs. Urinary findings can therefore indicate how effectively renal processes are compensating for changing acid demands. Interpreting these findings alongside acid-base disturbances helps connect renal activity with overall blood-pH regulation.