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Related Concept Videos

Disorders of Acid-Base Balance01:29

Disorders of Acid-Base Balance

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The human body maintains a precise pH range of arterial blood between 7.35 and 7.45. Deviations result in either acidosis (pH < 7.35) or alkalosis (pH > 7.45). These conditions are further classified as respiratory or metabolic disorders based on their underlying cause.
Respiratory Acidosis and Alkalosis
Respiratory acidosis occurs due to an increase in the partial pressure of carbon dioxide PCO2 in the blood. It often arises from shallow breathing or impaired gas exchange caused by...
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Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

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Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and...
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Acid-Base Balance01:25

Acid-Base Balance

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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...
3.1K
Respiratory Regulation of Acid-Base Balance01:18

Respiratory Regulation of Acid-Base Balance

2.1K
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...
2.1K
Bicarbonate-Carbonic Acid Buffer01:22

Bicarbonate-Carbonic Acid Buffer

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The carbonic acid-bicarbonate buffer system is critical for maintaining the body's pH balance. It operates on the equilibrium:
7.6K
pH Homeostasis01:31

pH Homeostasis

21.4K
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

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Establishment of an Extracellular Acidic pH Culture System
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Establishment of an Extracellular Acidic pH Culture System

Published on: November 19, 2017

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Understanding Acid Base Disorders.

Hernando Gomez1, John A Kellum1

  • 1Department of Critical Care Medicine, Center for Critical Care Nephrology, The CRISMA Center, University of Pittsburgh, 3550 Terrace Street, Pittsburgh, PA 15261, USA.

Critical Care Clinics
|September 28, 2015
PubMed
Summary
This summary is machine-generated.

Understanding acid base balance is crucial. This article explores three methods for assessing acid base status: the Henderson-Hasselbalch, standard base excess, and quantitative Stewart approaches.

Keywords:
Acid baseBase excessHenderson–HasselbalchHydrogenStewartStrong ion differencepH

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Area of Science:

  • Biochemistry
  • Physiology
  • Medical Science

Background:

  • Maintaining hydrogen ion concentration is vital for biological systems.
  • Current understanding of acid-base balance relies on established assessment methods.

Purpose of the Study:

  • To explore the origins and concepts behind current acid-base assessment methods.
  • To provide a foundational understanding of different approaches to acid-base analysis.

Main Methods:

  • Review of the historical development of acid-base assessment concepts.
  • Explanation of the traditional Henderson-Hasselbalch (physiologic) approach.
  • Description of the standard base excess (Van Slyke) and quantitative (Stewart) approaches.

Main Results:

  • Identified three primary methods for analyzing acid-base status.
  • Detailed the underlying principles of each approach: Henderson-Hasselbalch (HCO3-/Pco2), standard base excess, and Stewart (strong ion difference/total weak acids).

Conclusions:

  • The article traces the conceptual evolution of acid-base balance assessment.
  • Understanding these different approaches is key to interpreting acid-base status in biological solutions.