Examples of gastrointestinal (GI) tract in the following topics:
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- Upper GI series, also upper gastrointestinal (GI) tract radiography, is a radiologic examination of the upper gastrointestinal tract.
- Upper GI series, also known as upper gastrointestinal (GI) tract radiography, is a radiologic examination of the upper gastrointestinal tract .
- When the patient needs to undertake an upper GI, he or she may be asked to fast on the previous day.
- The upper GI tract consists of the esophagus, stomach, and duodenum.
- Describe the process and purpose of taking X-rays of the GI tract
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- The mucosa is the innermost layer of the gastrointestinal (GI) tract, composed of simple epithelium cells.
- It is the absorptive and secretory layer of the GI tract.
- The GI tract is composed of four layers.
- The mucosae (singular: mucosa) are highly specialized in each organ of the gastrointestinal tract, in order to deal with the different digestive tract conditions.
- Describe the structure and function of the mucosa of the GI tract
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- Example functions of the SNS include diverting blood flow away from the gastrointestinal (GI) tract and increasing heart rate.
- Example functions of the PSNS include dilating blood vessels leading to the GI tract and stimulating salivary gland secretion.
- Some functions of the SNS include diverting blood flow away from the gastrointestinal (GI) tract and skin via vasoconstriction, enhancing blood flow to skeletal muscles and the lungs, dilating the bronchioles of the lung allowing for greater oxygen exchange, and increasing heart rate.
- The PSNS typically functions in contrast to the SNS by dilating blood vessels leading to the GI tract, causing constriction of the pupil and contraction of the ciliary muscle to the lens to enable closer vision, and stimulating salivary gland secretion, in keeping with the rest and digest functions.
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- Malabsorption is a state arising from abnormality in absorption of food nutrients across the gastrointestinal (GI) tract.
- Malabsorption is a state arising from abnormality in absorption of food nutrients across the gastrointestinal (GI) tract.
- The main purpose of the gastrointestinal tract is to digest and absorb nutrients (fat, carbohydrate, protein, and fiber), micronutrients (vitamins and trace minerals), water, and electrolytes.
- Causes of malabsorption include infective agents, structural defects, mucosal abnormality, enzyme deficiencies, digestive failure, or other systemic diseases affecting the GI tract.
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- Throughout our gastrointestinal (GI) tract, each organ serves a specific purpose to bring our food from the plate to a digestible substance, from which nutrients can be extracted.
- The major organs within our digestive system can be split up into two major segments of this tube: the upper gastrointestinal tract, and the lower gastrointestinal tract.
- The upper gastrointestinal, or GI, tract is made up of three main parts: the esophagus, the stomach, and the small intestine.
- The bolus gets swallowed, and there begins its journey through the upper gastrointestinal tract.
- The stomach is a muscular, hollow bag, and it’s an important part of the upper GI tract.
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- The upper gastrointestinal tract consists of the esophagus, stomach, and duodenum.
- The lower gastrointestinal tract includes most of the small intestine and all of the large intestine .
- It contains the plicae circulares and villi to increase the surface area of that part of the GI Tract.
- The ligament of Treitz is sometimes used to divide the upper and lower GI tracts.
- This image shows the position of the small intestine in the gastrointestinal tract.
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- The digestive system functions via a system of long reflexes, short reflexes, and extrinsic reflexes from gastrointestinal (GI) peptides working together.
- The gastrocolic reflex is the physiological reflex controlling the motility, or peristalsis, of the gastrointestinal tract.
- GI peptides are signal molecules that are released into the blood by the GI cells themselves.
- They act on a variety of tissues including the brain, digestive accessory organs, and the GI tract.
- The gastrocolic reflex is one of a number of physiological reflexes controlling the motility, or peristalsis, of the gastrointestinal tract.
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- Parathyroid hormone maintains the body's calcium levels by increasing absorption of calcium from the bones, kidneys, and GI tract.
- Parathyroid hormone acts on the gastrointestinal tract to increase blood calcium by increasing the activity of the enzyme in the intestines that activates vitamin D.
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- The GI tract is composed of four layers.
- The muscularis in the stomach differs from that of other GI organs in that it has three layers of muscle instead of two.
- In the gastrointestinal tract, the submucosa is the layer of dense irregular connective tissue or loose connective tissue that supports the mucosa.
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- There are two main groups of adrenergic receptors, α and β, with several subtypes. α receptors have the subtypes α1 (a Gq coupled receptor) and α2 (a Gi coupled receptor).
- All three are linked to Gs proteins (although β2 also couples to Gi), which in turn are linked to adenylate cyclase.
- Common (or still unspecified) effects include: vasoconstriction of cardiac arteries (coronary artery), vasoconstriction of veins, and decreased motility of smooth muscle in the gastrointestinal tract.
- It causes vasoconstriction in many blood vessels, including those of the skin, gastrointestinal system, kidney (renal artery) and brain.
- Adrenaline and noradrenaline are ligands to α1, α2, or β-adrenergic receptors. α1 receptors couple to Gq, resulting in increased intracellular Ca2+ and causing smooth muscle contraction. α2 receptors couple to Gi, causing a decrease in cAMP activity and resulting in smooth muscle contraction. β receptors couple to Gs, increasing intracellular cAMP activity and resulting in heart muscle contraction, smooth muscle relaxation and glycogenolysis.