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Related Concept Videos

pH Regulation in Cells01:28

pH Regulation in Cells

6.5K
pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge on cellular membranes, and is crucial for metabolic reactions inside the cell. Moreover, cells use the energy from the proton motive force to generate ATP.
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
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pH Homeostasis01:31

pH Homeostasis

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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...
13.5K
Stomach pH Regulation01:21

Stomach pH Regulation

6.2K
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...
6.2K
Acid-Base Balance01:25

Acid-Base Balance

800
The human body maintains a narrow pH range regulated through acid-base balance. This balance is crucial as changes in the hydrogen ion concentration can disrupt cell membrane stability, alter protein structures, and change enzyme activities. The normal pH of arterial blood is 7.4, venous blood and interstitial fluid is 7.35, and intracellular fluid averages 7.0.
When the pH of arterial blood rises above 7.45, it results in a condition called alkalosis. Conversely, a drop below 7.35 leads to...
800
Factors Influencing Microbial Growth: pH01:29

Factors Influencing Microbial Growth: pH

171
Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...
171
Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

645
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...
645

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Related Experiment Video

Updated: Aug 31, 2025

Measurement of Vacuolar and Cytosolic pH In Vivo in Yeast Cell Suspensions
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Measurement of Vacuolar and Cytosolic pH In Vivo in Yeast Cell Suspensions

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Determinants, maintenance, and function of organellar pH.

Spencer A Freeman1,2, Sergio Grinstein1,2, John Orlowski3

  • 1Cell Biology Program, The Hospital for Sick Children, Washington, District of Columbia.

Physiological Reviews
|August 18, 2022
PubMed
Summary

Proton (H+) concentration and intracellular pH regulation are vital for cellular homeostasis and function. Recent advances have illuminated organellar pH determinants, impacting cellular processes in health and disease.

Keywords:
H+-ATPases (F-ATPases and V-ATPases)acid-base homeostasispH regulationproton (H+)-motive forceviral fusion

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Simultaneous pH Measurement in Endocytic and Cytosolic Compartments in Living Cells using Confocal Microscopy
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Simultaneous pH Measurement in Endocytic and Cytosolic Compartments in Living Cells using Confocal Microscopy

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Optical Quantification of Intracellular pH in Drosophila melanogaster Malpighian Tubule Epithelia with a Fluorescent Genetically-encoded pH Indicator
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Optical Quantification of Intracellular pH in Drosophila melanogaster Malpighian Tubule Epithelia with a Fluorescent Genetically-encoded pH Indicator

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Related Experiment Videos

Last Updated: Aug 31, 2025

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Measurement of Vacuolar and Cytosolic pH In Vivo in Yeast Cell Suspensions

Published on: April 19, 2013

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Simultaneous pH Measurement in Endocytic and Cytosolic Compartments in Living Cells using Confocal Microscopy
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Optical Quantification of Intracellular pH in Drosophila melanogaster Malpighian Tubule Epithelia with a Fluorescent Genetically-encoded pH Indicator
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Physiology

Background:

  • Protonation state influences macromolecule function and cellular energy.
  • Intracellular pH regulation is critical for homeostasis.
  • Organellar pH determinants are less understood than cytosolic pH.

Purpose of the Study:

  • Review recent advances in understanding organellar pH.
  • Characterize pumps, channels, and transporters involved in pH regulation.
  • Discuss implications for cellular function in health and disease.

Main Methods:

  • Targeting molecular probes to organellar lumen.
  • Genomic, proteomic, and electrophysiological techniques.
  • Identification and characterization of unique transporters.

Main Results:

  • Unique pumps, channels, and transporters identified.
  • Mechanisms for establishing and maintaining organellar pH elucidated.
  • Advances in techniques enable organellar pH studies.

Conclusions:

  • Understanding organellar pH is crucial for cellular function.
  • Dysregulation of organellar pH is linked to disease.
  • Future research directions in organellar pH homeostasis.