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What is Monogastric Digestion?

What is Monogastric Digestion?

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.

Gross Anatomy of the Stomach

Gross Anatomy of the Stomach

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...

Stomach Histology

Stomach Histology

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...

Intestinal Phase of Digestion

Intestinal Phase of Digestion

The intestinal phase of digestion is the third and final stage of the digestive process, occurring after the cephalic and gastric phases. It begins when chyme, a partially digested mixture of food and digestive enzymes, enters the small intestine from the stomach. This phase is crucial for nutrient absorption and involves complex hormonal and enzymatic interactions.
The arrival of the chyme in the small intestine distends the duodenum, which triggers the enterogastric reflex. This distension...

Gastric Motility

Gastric Motility

Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...

Gastric Emptying

Gastric Emptying

Gastric emptying occurs when the stomach gradually releases chyme into the duodenum. When the stomach is distended, it triggers the release of gastrin, a hormone that promotes gastric acid secretion to aid in digestion. Additionally, stomach distension contributes to peristaltic waves that propel gastric contents toward the pyloric region. The gastroenteric reflex, on the other hand, primarily stimulates peristalsis in the intestines, facilitating the movement of contents further along the...

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Intrinsic emptying pattern of the human stomach.

J L Smith, C L Jiang, J N Hunt

The American Journal of Physiology

|June 1, 1984

Summary

Gastric emptying follows an exponential pattern, with minimal slowing observed when duodenal receptors are stimulated by 120 mM sodium chloride (NaCl) solutions. This study clarifies intrinsic gastric emptying dynamics.

Area of Science:

Gastroenterology
Physiology

Background:

Gastric emptying is a complex physiological process influenced by various factors.
Understanding the intrinsic pattern of gastric emptying is crucial for diagnosing and managing gastrointestinal disorders.

Purpose of the Study:

To determine the intrinsic gastric emptying pattern in humans.
To investigate the effect of duodenal receptors on gastric emptying using saline solutions.

Main Methods:

Twenty-three subjects consumed 750 ml saline meals.
Gastric content was recovered at 5, 10, and 20 minutes post-ingestion.
Statistical analysis using within-subject regressions and an exponential model was performed.

Main Results:

Gastric emptying data were best described by an exponential model when initial volume was included.

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A 120 mM sodium chloride (NaCl) solution minimally slowed gastric emptying, indicating a minor role for duodenal receptors in this context.

Conclusions:

The intrinsic pattern of human gastric emptying can be accurately modeled exponentially.
Duodenal receptors exert minimal inhibitory control over gastric emptying when stimulated by a 120 mM NaCl solution.