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Related Concept Videos

pH Homeostasis01:31

pH Homeostasis

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 Regulation of...
Acid-Base Balance01:25

Acid-Base Balance

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

Respiratory Regulation of Acid-Base Balance

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 produced, leading to a...
Renal Regulation of Acid-Base Balance01:29

Renal Regulation of Acid-Base Balance

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...
Disorders of Acid-Base Balance01:29

Disorders of Acid-Base Balance

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...
Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

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 HCO3−  values are examined to...

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Related Experiment Video

Updated: Jun 13, 2026

Determining the Contribution of the Energy Systems During Exercise
11:15

Determining the Contribution of the Energy Systems During Exercise

Published on: March 20, 2012

[Acid-base balance during exercise].

M Kanauchi1, H Ishikawa

  • 1First Department of Internal Medicine, Nara Medical University.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|September 1, 1992
PubMed
Summary
This summary is machine-generated.

Exercise intensity impacts energy production, shifting from aerobic to anaerobic processes. This leads to lactate and proton accumulation, causing metabolic acidosis, which is linked to blood pH changes in healthy males.

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Area of Science:

  • Exercise Physiology
  • Biochemistry
  • Acid-Base Balance

Context:

  • Energy metabolism during exercise shifts from aerobic to anaerobic pathways as intensity increases.
  • Anaerobic metabolism produces end products like lactate, influencing acid-base balance.
  • Exhaustive exercise leads to significant lactate and proton accumulation, resulting in metabolic acidosis.

Purpose:

  • To investigate the relationship between exercise intensity, energy metabolism, and acid-base regulation.
  • To examine the accumulation of lactate and protons during exhaustive exercise.
  • To understand the mechanisms controlling acid-base balance during exercise.

Summary:

  • During light exercise, energy is primarily aerobic, but anaerobic processes dominate as intensity rises.
  • Lactate and proton accumulation during strenuous exercise causes metabolic acidosis.
  • Intramuscle, blood, and physiological buffers regulate acid-base status.
  • In healthy males, post-exercise blood pH changes correlate with lactate levels, consistent with metabolic acidosis.

Impact:

  • Provides insights into the physiological responses to varying exercise intensities.
  • Highlights the role of lactate in exercise-induced metabolic acidosis.
  • Establishes a link between blood pH, lactate content, and exercise.
  • Discusses implications for individuals with underlying health conditions.