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Ch. 22 The Digestive System
Amerman- Human Anatomy & Physiology 3e
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoAmerman 3rd EditionCh. 22 The Digestive SystemProblema 17
Capitolo 22, Problema 17

Lipids associate with bile salts in the small intestine to form_____ . In the enterocyte, lipids are packaged with other lipids into______.

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Understand the role of bile salts in lipid digestion: Bile salts are amphipathic molecules produced by the liver and stored in the gallbladder. They help emulsify lipids in the small intestine, breaking them into smaller droplets to increase surface area for enzymatic action.
Learn about micelle formation: Lipids, such as fatty acids and monoglycerides, combine with bile salts to form micelles. Micelles are small, spherical structures that transport lipids across the intestinal lumen to the enterocytes (intestinal cells).
Explore lipid absorption in enterocytes: Once micelles deliver lipids to the enterocytes, the lipids are absorbed into the cells. Inside the enterocytes, these lipids are reassembled into triglycerides.
Understand the packaging of lipids: In the enterocytes, triglycerides are combined with cholesterol, phospholipids, and proteins to form chylomicrons. Chylomicrons are lipoprotein particles that transport lipids through the lymphatic system and into the bloodstream.
Summarize the process: Lipids associate with bile salts in the small intestine to form micelles. In the enterocyte, lipids are packaged with other lipids into chylomicrons for transport.

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Micelles

Micelles are spherical structures formed when bile salts interact with lipids in the small intestine. They facilitate the digestion and absorption of dietary fats by solubilizing lipids, allowing them to be more easily absorbed by the intestinal cells. The hydrophobic tails of bile salts surround the lipid molecules, while the hydrophilic heads face outward, creating a stable structure in the aqueous environment of the intestine.

Chylomicrons

Chylomicrons are lipoprotein particles that transport dietary lipids from the intestines to other locations in the body. In enterocytes, lipids are packaged into chylomicrons along with proteins and cholesterol, which helps in their transport through the lymphatic system and into the bloodstream. This process is crucial for the distribution of fats and fat-soluble vitamins throughout the body.

Enterocytes

Enterocytes are specialized epithelial cells lining the small intestine, playing a key role in nutrient absorption. They are responsible for the uptake of lipids, carbohydrates, and proteins from digested food. Enterocytes contain various transport mechanisms and enzymes that facilitate the absorption and processing of these nutrients, including the formation of chylomicrons from absorbed lipids.
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Small Intestine Example 3
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Domanda del libro di testo

Which of the following best describes the role of bile salts in lipid digestion?

a. Bile salts begin chemical digestion of lipids.

b. Bile salts bind to lipids and physically break them apart into monoglycerides and free fatty acids.

c. Bile salts bind to lipids and physically break them apart into smaller pieces.

d. Bile salts interact with pancreatic lipase and catalyze lipid breakdown.

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Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

The exocrine cells of the pancreas and salivary glands are islet cells.

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Domanda del libro di testo

The common hepatic duct and main pancreatic duct enter into the:

a. Pyloric sphincter

b. Duodenum

c. Ileum

d. Cecum

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Domanda del libro di testo

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

e. During feeding, the small intestine exhibits motion in the migrating motor complex pattern.

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Domanda del libro di testo

The peritoneal cavity is located:

a. Around each of the digestive organs

b. Between layers of mesentery

c. Superior to the greater omentum

d. Between the parietal and visceral peritoneum

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Which of the following occurs/occur during the cephalic phase of gastric acid secretion?

a. Stimulation of gastrin and histamine release

b. Direct stimulation of parietal cells

c. Inhibition of somatostatin release

d. Both a and b are correct

e. All of the above are correct

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