Extracellular Fluid Buffering
Extracellular Fluid Buffering - Related Videos
08:33
Vampiric Isolation of Extracellular Fluid from Caenorhabditis elegans
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Cited by 4 •
2012
The model organism C. elegans uses pseudocoelomic fluid as a passive circulatory system. Direct assay of this fluid has not been previously possible. Here we present a novel technique to directly assay the extracellular space, and use systemic silencing signals during an RNAi response as a proof of principle example.
02:29
Microdialysis of Interstitial Fluid from a Mouse Brain to Isolate Extracellular Proteins
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2025
The video demonstrates the process of using a microdialysis probe to collect extracellular proteins from the interstitial fluid (ISF) of a mouse brain. A microdialysis probe, equipped with a high-molecular-weight cut-off semi-permeable membrane, is inserted into the brain of an anesthetized mouse via an implanted guide cannula. The probe, connected to pumps, allows a physiological buffer to perfuse the brain tissue and mix with the ISF. Proteins in the ISF diffuse across the semi-permeable...
02:56
Buffers
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2020
A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
04:35
Buffers - Concepts
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2020
Buffers When an Arrhenius acid (HA) is added to water, it dissociates into its conjugate base (A-) and a hydrogen cation (H+). HA + H2O → H+(aq) + A-(aq) The amount of hydrogen ions present in the solution determines the acidity of the solution, where more hydrogen ions indicate a lower or more acidic pH. Similarly, when a strong Arrhenius base (BOH) is added to water, it dissociates into its conjugate acid (B+) and a hydroxide ion (OH-). BOH + H2O → B+(aq) + OH-(aq) Generally, the addition of...
03:37
Visualization of Extracellular Traps in Macrophages from Human Bronchoalveolar Lavage Fluids
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2025
This video demonstrates the immunolabeling of macrophage extracellular traps, METs, in bronchoalveolar macrophages from bronchoalveolar lavage fluid, and their visualization using a confocal microscope.
FAQs
The bicarbonate system uses reversible chemical reactions to shift between carbonic acid, hydrogen ions, bicarbonate, and carbon dioxide. Changes in one component can therefore be countered by changes in the others, reducing the size of pH disturbances. This interconnected chemistry makes bicarbonate a central regulator of extracellular fluid conditions relevant to cellular function.
The lungs regulate carbon dioxide, which participates in the reversible conversion to carbonic acid. The kidneys adjust bicarbonate levels and hydrogen-ion excretion, providing a different route for controlling acid-base conditions. Because these organs influence different components of the buffer system, their coordinated actions help sustain extracellular fluid pH when physiological conditions change.
Protein and phosphate buffers provide additional buffering capacity alongside bicarbonate. Their contribution is especially important in particular fluid compartments, where the available chemical components may differ. Considering these systems together gives a more complete account of acid-base homeostasis than examining bicarbonate alone and helps explain why extracellular fluid buffering depends on multiple interacting mechanisms.
Respiratory and metabolic acidosis or alkalosis reflect different physiological contexts in which acid-base balance is disturbed. Extracellular fluid buffering provides the chemical framework for interpreting these conditions, while lung control of carbon dioxide and kidney regulation of bicarbonate and hydrogen-ion excretion identify the major regulatory systems involved. This connection links molecular reactions with whole-body physiology.
Analysis should consider the reversible bicarbonate reactions together with carbon dioxide regulation, bicarbonate adjustment, and hydrogen-ion excretion. Protein and phosphate buffering also deserve attention because their importance varies among fluid compartments. Evaluating these components as a coordinated system helps determine how the body is limiting the pH change rather than focusing on one reaction in isolation.
Cells require suitable chemical conditions to function, so disturbances in extracellular fluid pH can be understood through the systems that oppose those changes. Studying bicarbonate, protein, and phosphate buffers alongside lung and kidney regulation connects chemical equilibrium with organ physiology. This framework is useful for explaining acid-base homeostasis and the physiological context of acidosis and alkalosis.