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Related Concept Videos

Absorption of Nutrients01:19

Absorption of Nutrients

2.4K
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...
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Glucose Absorption Into the Small Intestine01:26

Glucose Absorption Into the Small Intestine

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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...
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Transcellular Transport of Solutes01:23

Transcellular Transport of Solutes

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Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
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Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
536
Carbohydrate Absorption01:25

Carbohydrate Absorption

2.8K
Carbohydrates are essential macronutrients that serve as the body's primary energy source. Their digestion begins in the mouth, where salivary amylase partially breaks down complex carbohydrates such as starch into smaller oligosaccharides. This mechanical and enzymatic activity prepares carbohydrates for further processing in the gastrointestinal tract.
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...
2.8K
Anatomy of the Intestines01:23

Anatomy of the Intestines

86.4K
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...
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Related Experiment Video

Updated: Jan 3, 2026

Author Spotlight: Integrating Single-Cell Transcriptomics with Organoid Cultures for Advanced Research and Therapeutic Insights
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Single-cell transcriptome analysis reveals differential nutrient absorption functions in human intestine.

Yalong Wang1, Wanlu Song2, Jilian Wang3

  • 1The State Key Laboratory of Membrane Biology, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, China.

The Journal of Experimental Medicine
|November 23, 2019
PubMed
Summary

This study maps human intestinal cells using single-cell RNA sequencing, identifying new markers and cell types. Findings reveal distinct nutrient absorption and offer insights into intestinal diseases like IBD.

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Area of Science:

  • Gastroenterology and Molecular Biology
  • Single-cell genomics of the human intestine

Background:

  • The human intestine's cellular makeup and functions are not fully understood.
  • Cell type-specific markers are lacking for human intestinal epithelium.

Purpose of the Study:

  • To characterize human intestinal epithelial cell types and functions using single-cell RNA sequencing.
  • To identify novel marker genes for human intestinal cell types.
  • To compare human and mouse intestinal cellular landscapes.

Main Methods:

  • Single-cell RNA sequencing of 14,537 human ileum, colon, and rectum epithelial cells.
  • Validation using quantitative PCR, immunofluorescence, and functional analyses.

Main Results:

  • Revealed distinct nutrient absorption preferences between small and large intestines.
  • Suggested the presence of Paneth-like cells in the large intestine.
  • Identified potential new marker genes for human transient-amplifying and goblet cells.
  • Highlighted common and differential cellular features between human and mouse ilea.

Conclusions:

  • Provides a comprehensive cell atlas of the human intestine.
  • Offers foundational data for understanding human intestinal disorders, including inflammatory bowel disease and tumorigenesis.
  • Facilitates detailed characterization of human intestinal cell constitution and functions.