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Related Concept Videos

What is Monogastric Digestion?01:50

What is Monogastric Digestion?

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The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.
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Anatomy of the Intestines01:23

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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
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Physiology of the Gastrointestinal System II: Digestion and Absorption01:22

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The gastrointestinal (GI) tract, extending from the mouth to the anus, plays a pivotal role in the digestion and absorption of nutrients. This process involves both mechanical and chemical actions facilitated by various enzymes.
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Lipid Digestion01:06

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Lipids are large molecules that are generally not water-soluble. Since most of the digestive enzymes in the human body are water-based, there are specific steps the body must take to break down lipids and make them available for use.
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Neural Regulation01:37

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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.
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The process of digestion is composed of three stages – cephalic, gastric, and intestinal – each with a distinct control center. The cephalic phase is the first stage, and it starts even before the food enters the stomach. It is controlled by the central nervous system and is initiated by any food-related sensory stimuli, such as the sight and smell of food, which send signals to the brain. While eating, the taste receptors intensify these signals, which travel to the cerebral cortex...
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Effect of Hyaluronic Acid 35 kDa on an In Vitro Model of Preterm Small Intestinal Injury and Healing Using Enteroid-Derived Monolayers
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Digestion in the newborn

M Hamosh1

  • 1Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA.

Clinics in Perinatology
|June 1, 1996
PubMed
Summary
This summary is machine-generated.

Newborns achieve adequate digestion through compensatory systems, not just immature adult mechanisms. Infant digestion utilizes gastric lipase and intestinal enzymes effectively for nutrient absorption.

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Area of Science:

  • Neonatal physiology
  • Digestive system development
  • Nutrient metabolism

Background:

  • Infant digestion differs significantly from adult patterns.
  • Limited quantitative data exists on individual enzyme contributions to neonatal digestion.
  • Adult digestive mechanisms are often immature in newborns.

Purpose of the Study:

  • To elucidate the quantitative roles of specific enzymes in newborn digestion.
  • To understand the compensatory mechanisms enabling nutrient digestion in infants.
  • To compare neonatal and adult digestive enzyme activity.

Main Methods:

  • Analysis of enzymatic activity in gastric and intestinal fluids.
  • Assessment of nutrient digestion and absorption in newborns.
  • Comparison of digestive enzyme profiles in infants versus adults.

Main Results:

  • Gastric proteolysis is limited, but intestinal protein digestion is adequate in infants.
  • Human milk amylase aids starch digestion in breast-fed infants.
  • Gastric lipase and milk lipase significantly contribute to fat digestion in newborns, exceeding adult levels.
  • Lactose and glucose polymer digestion occurs via brush border enzymes.
  • Protein absorption is linked to protein glycosylation rather than enzyme immaturity.

Conclusions:

  • Infants possess robust compensatory digestive systems.
  • Neonatal digestion relies on a combination of endogenous enzymes and milk-derived factors.
  • Specific enzymes like gastric lipase play a more critical role in infants than adults.