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Related Concept Videos

Mucosal Barrier of the Stomach01:25

Mucosal Barrier of the Stomach

The gastric glands contain parietal cells that secrete hydrochloric acid (HCl) for digestion. The cells secrete HCl because it is highly corrosive and essential for breaking down food. To achieve this, they secrete hydrogen and chloride ions into the lumen of the gastric glands, which combine to form HCl.
Within parietal cells, carbonic acid is first formed through the reaction of water and carbon dioxide. The dissociation of carbonic acid releases bicarbonate and hydrogen ions. The bicarbonate...
Stomach pH Regulation01:21

Stomach pH Regulation

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...
Gastric Phase of Digestion01:26

Gastric Phase of Digestion

The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
When food enters the stomach, it stretches the stomach walls and activates stretch receptors. This triggers local reflexes of the enteric nervous system, mediated through the myenteric plexus. These...
Pathophysiology of Peptic Ulcer Disease: Injurious Factors01:22

Pathophysiology of Peptic Ulcer Disease: Injurious Factors

Peptic ulcers are sores on the stomach's inner lining and the upper small intestine, which are the result of disruptions in the mucosal layer that houses parietal cells which produce gastric acid, and chief cells which secrete pepsinogen.
In the antrum region, G cells secrete the gastrin hormone that binds to gastrin-cholecystokinin-B (CCK2) receptors on parietal and enterochromaffin-like (ECL) cells in the fundic glands. Simultaneously, the vagus nerve releases acetylcholine, which binds to M3...
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 Suppressive Drugs for Peptic Ulcer Disease: Antacids01:31

Acid Suppressive Drugs for Peptic Ulcer Disease: Antacids

In the complex environment of the gastric lumen, excessive acid secretion can lead to the formation or worsening of ulcers within the delicate mucosal layer. Antacids, such as sodium bicarbonate and calcium carbonate, provide relief by neutralizing this acid, transforming it into harmless salt and water. This neutralization process raises the gastric pH from a highly acidic level of 1 to a more basic 3-4, reducing the acidity within the stomach.
However, this neutralization reaction between...

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Related Experiment Video

Updated: Jul 4, 2026

Profiling Luminal pH in Three-Dimensional Gastrointestinal Organoids Using Microelectrodes
08:24

Profiling Luminal pH in Three-Dimensional Gastrointestinal Organoids Using Microelectrodes

Published on: July 5, 2024

Do we need gastric acid?

D Pohl1, M Fox, M Fried

  • 1Division of Gastroenterology, Department of Internal Medicine, University Hospital Zurich, Zurich, Switzerland. daniel.pohl@usz.ch

Digestion
|July 3, 2008
PubMed
Summary
This summary is machine-generated.

Gastric acid, essential for vertebrate evolution, is conserved across species. Modern humans may not need it due to effective acid suppression drugs, questioning its necessity.

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Area of Science:

  • Evolutionary Biology
  • Gastroenterology
  • Physiology

Background:

  • Gastric acid secretion evolved ~350 million years ago in vertebrates.
  • Conserved cellular mechanisms for acid production exist across species.
  • Proton pump inhibitors demonstrate broad efficacy, raising questions about modern human necessity.

Purpose of the Study:

  • To evaluate the necessity, production, and effects of gastric acid in modern humans.
  • To explore the role of gastric acid in upper gastrointestinal motility, neuroendocrine factors, digestive processes, microbiology, and central/psychological functions.

Main Methods:

  • Comparative analysis of animal and human studies.
  • Investigation of pharmacologic, surgical, and pathophysiologic states of acid suppression.
  • Review of evidence concerning upper GI motility, neuroendocrine regulation, digestion, mucosal integrity, and microbiology.

Main Results:

  • Gastric acid's evolutionary advantage is suggested by its ancient origins and conserved mechanisms.
  • The widespread availability of effective acid suppression challenges the indispensable role of gastric acid in contemporary humans.
  • Multiple factors, including motility, neuroendocrine signals, digestion, and microbiology, are influenced by gastric acid levels.

Conclusions:

  • The evolutionary persistence of gastric acid suggests a significant biological role.
  • Modern pharmacologic interventions question the essentiality of endogenous gastric acid for human health.
  • Further research is warranted to fully understand the multifaceted roles and implications of gastric acid in human physiology and disease.