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Related Concept Videos

Absorption of Nutrients01:19

Absorption of Nutrients

Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
Neural Regulation01:37

Neural Regulation

Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
Regulation of Food Intake01:30

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
Glucose Absorption Into the Small Intestine01:26

Glucose Absorption Into the Small Intestine

Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and 'exit' via the...
Enteric Nervous System: Regulation of GI Motor Activity01:11

Enteric Nervous System: Regulation of GI Motor Activity

The Enteric Nervous System (ENS) plays a pivotal role in regulating gastrointestinal or GI motor activity. This complex network of nerves, deeply embedded within the gut wall, responds to changes in the gut environment and receives input from both the autonomic nervous system and the central nervous system. By doing so, the ENS operates various programs tailored to the body's nutritional status and needs.
During periods of fasting, the ENS initiates the migrating myoelectric complex, a program...
Anatomy of the Intestines01:23

Anatomy of the Intestines

Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the small...

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Related Experiment Video

Updated: May 25, 2026

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation
07:29

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation

Published on: December 29, 2023

Intestinal sensing of nutrients.

Gwen Tolhurst1, Frank Reimann, Fiona M Gribble

  • 1Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0XY, UK.

Handbook of Experimental Pharmacology
|January 18, 2012
PubMed
Summary

Ingesting food activates specialized gut cells that sense nutrients. These cells release signals regulating appetite and blood sugar levels through complex molecular pathways.

Area of Science:

  • Gastroenterology
  • Endocrinology
  • Molecular Biology

Background:

  • Meal ingestion initiates physiological responses affecting both the gut and remote systems like appetite and glucose homeostasis.
  • The intestinal epithelium contains specialized chemosensitive cells, including enteroendocrine and tuft cells, that directly interact with luminal contents.

Purpose of the Study:

  • To discuss current knowledge of molecular mechanisms in intestinal chemosensation.
  • To focus on nutrient-triggered secretion from the enteroendocrine system.

Main Methods:

  • Review of molecular signaling pathways involved in chemosensation.
  • Analysis of G-protein-coupled receptors and solute carrier transporters.
  • Examination of enteroendocrine cell function.

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Studying Murine Small Bowel Mechanosensing of Luminal Particulates
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Studying Murine Small Bowel Mechanosensing of Luminal Particulates

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Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
06:04

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Published on: February 9, 2016

Related Experiment Videos

Last Updated: May 25, 2026

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation
07:29

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation

Published on: December 29, 2023

Studying Murine Small Bowel Mechanosensing of Luminal Particulates
10:21

Studying Murine Small Bowel Mechanosensing of Luminal Particulates

Published on: March 18, 2022

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease
06:04

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

Published on: February 9, 2016

Main Results:

  • Intestinal chemosensation involves complex signaling pathways.
  • Nutrient sensing by gut cells triggers the release of chemical mediators.
  • These mediators act locally (paracrine) or as circulating hormones.

Conclusions:

  • Enteroendocrine cells play a crucial role in sensing nutrients and regulating systemic physiology.
  • Understanding these molecular mechanisms is key to comprehending appetite and glucose homeostasis.