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Related Concept Videos

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The human stomach is a vital part of the digestive system, performing multiple functions. It is located within the peritoneum, a serous membrane that lines the abdominal cavity. The stomach plays a central role in processing food substances and interacts with other digestive organs through coordinated digestive processes. The stomach has a characteristic J-shape and is divided into four main regions. The cardia is the first section where the esophagus connects to the stomach and is the entry...
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The stomach comprises several layers that work together to facilitate digestion and protect the organ. The outermost layer is called the serosa, which provides support and protection to the stomach. The muscularis externa layer is responsible for the mechanical breakdown of food by contracting and moving the stomach. The submucosa layer, located beneath the muscularis externa, contains connective tissue, blood vessels, nerves, and glands that secrete mucus and other substances essential for...
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Related Experiment Video

Updated: Sep 17, 2025

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A second look at the stomach - a fishy perspective.

Patrícia G Ferreira1, L Filipe C Castro2,3, Jonathan M Wilson1

  • 1Department of Biology, Wilfrid Laurier University, Waterloo, ON, N2L 3C5, Canada.

The Journal of Experimental Biology
|July 1, 2025
PubMed
Summary

Stomach acidification is vital for vertebrate digestion and growth, but its precise role remains debated. This commentary clarifies current understanding and explores the loss of gastric function in fishes.

Keywords:
AcidificationDigestionGastric proton pumpKnockoutMicrobiomeSecondary loss

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Area of Science:

  • Physiology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Stomach acidification is a key digestive process in vertebrates.
  • Its exact contributions to protein digestion, nutrient absorption, growth, metabolism, and development are not fully understood.
  • The repeated loss of gastric function in fishes presents an evolutionary puzzle.

Purpose of the Study:

  • To summarize the current understanding of stomach acidification's role in vertebrates.
  • To identify unresolved questions and suggest experimental approaches.
  • To explore the evolutionary and physiological aspects of gastric function loss in fishes.

Main Methods:

  • This study is a commentary, not an experimental study.
  • It synthesizes existing research and proposes future research directions.
  • It involves in-depth exploration of evolutionary and physiological data.

Main Results:

  • The precise contribution of stomach acidification to vertebrate physiology is still debated.
  • Experimental approaches are needed to fully elucidate its role.
  • The repeated loss of gastric function in fishes is a significant evolutionary phenomenon.

Conclusions:

  • Clarifying the role of the gastric proton pump and stomach acidification is crucial for understanding digestion, metabolism, and growth in vertebrates.
  • Further research is needed to address the unresolved questions surrounding gastric function.
  • Understanding gastric function loss in fishes offers insights into vertebrate evolution.