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Related Concept Videos

Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

438
Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...
438
Stomach pH Regulation01:21

Stomach pH Regulation

6.0K
The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
The acid-secreting gastric mucosal epithelial cells (parietal cells) lining the stomach lumen maintain the low pH in the lumen. Numerous ion transporters and channels on these parietal...
6.0K
Bicarbonate-Carbonic Acid Buffer01:22

Bicarbonate-Carbonic Acid Buffer

1.3K
The carbonic acid-bicarbonate buffer system is critical for maintaining the body's pH balance. It operates on the equilibrium:
1.3K
Respiratory Regulation of Acid-Base Balance01:18

Respiratory Regulation of Acid-Base Balance

395
Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2​​ and pH.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are...
395
Roles of Electrolytes: Chloride and Bicarbonate01:29

Roles of Electrolytes: Chloride and Bicarbonate

219
Chloride ions contribute to the osmotic pressure gradient distinguishing the intracellular fluid (ICF) from the extracellular fluid (ECF). They counterbalance positively charged ions in the ECF and ensure its electrochemical stability. The renal system's process of chloride absorption and release generally mirrors that of sodium ions.
Conditions such as hypochloremia can arise from insufficient chloride reabsorption by the kidneys, often compounded by extended bouts of diarrhea, vomiting,...
219
pH Homeostasis01:31

pH Homeostasis

12.7K
Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because it is critical for the optimal activity of enzymes involved in metabolic reactions. Enzymes are basically proteins, so, any significant change in pH can affect their structure and activity. In humans, pH is regulated using three primary mechanisms— chemical buffer systems, respiratory regulation, and renal regulation.
Respiratory...
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Related Experiment Video

Updated: Jul 2, 2025

In vitro Monitoring of Extracellular pH in Real-Time
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In vitro Monitoring of Extracellular pH in Real-Time

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Bicarbonate secretion and acid/base sensing by the intestine.

Holger M Becker1, Ursula E Seidler2

  • 1Department of Gastroenterology, Hannover Medical School, 30625, Hannover, Germany.

Pflugers Archiv : European Journal of Physiology
|February 19, 2024
PubMed
Summary

Intestinal bicarbonate transport is crucial for gut pH and fluid balance. Recent advances reveal molecular regulation, disease links, and potential treatments for altered luminal alkalinity.

Keywords:
CFTRColonCongenital chloride diarrheaCystic fibrosisInflammatory bowel diseaseIntestineSLC26a3SLC26a6Sodium bicarbonate cotransporter

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Area of Science:

  • Gastroenterology
  • Cell Biology
  • Physiology

Background:

  • Bicarbonate (HCO3-) transport across enterocytes regulates intracellular and luminal pH, vital for gut fluid movement.
  • The role of HCO3- transport in intestinal function has been recognized since the 1970s, with key proteins identified and characterized.
  • Knockout mouse models have elucidated the specific roles of these transport proteins in various gut functions.

Purpose of the Study:

  • To review recent progress in understanding intestinal HCO3- transport over the last decade.
  • To highlight novel techniques and molecular findings in the regulation of intestinal HCO3- transport across different gut segments.
  • To discuss human diseases linked to defective intestinal HCO3- secretion and explore therapeutic strategies.

Main Methods:

  • Literature review focusing on advancements in the last 10 years.
  • Analysis of molecular characterization of ion transport proteins.
  • Examination of data from knockout mouse models and human disease studies.

Main Results:

  • Significant progress in identifying molecular regulators of intestinal HCO3- transport.
  • Insights into the specific functions of HCO3- transporters in different intestinal segments.
  • Identification of human diseases associated with impaired HCO3- secretion and potential therapeutic targets.

Conclusions:

  • Intestinal bicarbonate transport is a complex process with critical roles in gut physiology.
  • Understanding molecular regulation and disease mechanisms opens avenues for novel treatment strategies.
  • Further research into acid/base sensing mechanisms in the gut is warranted.