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Related Concept Videos

Neural Regulation01:37

Neural Regulation

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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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Hormonal Regulation01:40

Hormonal Regulation

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Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.
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Gastric Phase of Digestion01:26

Gastric Phase of Digestion

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The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
When food enters the stomach, it stretches the stomach walls and activates stretch receptors. This triggers local reflexes of the enteric nervous system, mediated through the myenteric plexus. These...
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Intestinal Phase of Digestion01:29

Intestinal Phase of Digestion

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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...
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Gastric Motility01:16

Gastric Motility

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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...
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Gastric Emptying01:16

Gastric Emptying

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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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Assessment of Gastric Emptying in Non-obese Diabetic Mice Using a [13C]-octanoic Acid Breath Test
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Metabolic changes associated with gastric stimulation

S J Hersey

    Gastroenterology
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    Summary
    This summary is machine-generated.

    Frog gastric mucosa preferentially uses butyrate over glucose for energy. This substrate preference is key for acid secretion, suggesting specific metabolic pathways regulate gastric function and energy utilization.

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    Area of Science:

    • Biochemistry
    • Physiology
    • Gastroenterology

    Background:

    • Gastric acid secretion is an energy-intensive process.
    • The metabolic pathways fueling gastric secretion are not fully understood.
    • Substrate utilization by gastric mucosa is a critical area of research.

    Purpose of the Study:

    • To investigate substrate utilization by gastric mucosa during acid secretion.
    • To determine the role of specific substrates in stimulating gastric respiration and acid secretion.
    • To elucidate the energy sources and rate-limiting steps in gastric acid production.

    Main Methods:

    • In vitro studies using radioactively labeled substrates (butyrate, glucose, pyruvate) with frog gastric mucosa.
    • Experiments with theophylline and dinitrophenol to stimulate respiration.
    • Studies on rabbit gastric tubules to assess species specificity.
    • Inhibition studies using amytal and menadione to probe energy pathways.

    Main Results:

    • Frog gastric mucosa preferentially utilizes butyrate over glucose or pyruvate.
    • Theophylline stimulation maintains butyrate preference, while dinitrophenol shifts metabolism towards glucose.
    • Butyrate oxidation correlates with stimulated respiration.
    • ATP and phosphocreatine are insufficient for maximal gastric secretion, suggesting a specific amytal-sensitive reaction.

    Conclusions:

    • Specific substrates, particularly butyrate, play a crucial role in stimulating gastric acid secretion and respiration.
    • Theophylline-stimulated respiration is not solely driven by increased energy demand (ADP levels).
    • A specific amytal-sensitive reaction, supplied by substrates like butyrate, is a rate-limiting step for gastric acid secretion.