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Ch. 22 The Digestive System
Amerman - Human Anatomy & Physiology 2nd Edition
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Amerman 2nd EditionCh. 22 The Digestive System문제 13
22장, 문제 13

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.

검증된 단계별 안내
1
Understand the role of bile salts in lipid digestion: Bile salts are produced by the liver and stored in the gallbladder. They are released into the small intestine to aid in the digestion of lipids (fats). Their primary function is to emulsify fats, which means breaking large fat globules into smaller droplets to increase the surface area for enzymatic action.
Clarify the process of lipid digestion: Lipid digestion involves two main steps. First, bile salts emulsify fats into smaller droplets. Second, pancreatic lipase (an enzyme) chemically breaks down these smaller fat droplets into monoglycerides and free fatty acids.
Eliminate incorrect options: Option (a) is incorrect because bile salts do not chemically digest lipids; they only emulsify them. Option (b) is incorrect because bile salts do not directly break lipids into monoglycerides and free fatty acids; this is the role of pancreatic lipase. Option (d) is incorrect because bile salts do not catalyze lipid breakdown; they facilitate the process by increasing the surface area for enzymes.
Focus on the correct description: Option (c) is correct because bile salts bind to lipids and physically break them apart into smaller pieces (emulsification). This process is mechanical, not chemical, and it prepares lipids for enzymatic digestion by pancreatic lipase.
Summarize the key concept: Bile salts play a crucial role in lipid digestion by emulsifying fats, which increases the efficiency of enzymatic breakdown by pancreatic lipase. This process is essential for the absorption of lipids in the small intestine.

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주요 개념

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Bile Salts

Bile salts are amphipathic molecules derived from cholesterol, produced in the liver and stored in the gallbladder. They play a crucial role in the emulsification of dietary fats, allowing for better interaction with digestive enzymes. Their structure enables them to interact with both water and lipids, facilitating the breakdown of large fat globules into smaller droplets.
추천 영상:
6:54
Gallbladder and Bile

Emulsification

Emulsification is the process by which bile salts disperse fats into smaller droplets, increasing the surface area for digestive enzymes to act upon. This physical breakdown is essential for lipid digestion, as it allows enzymes like pancreatic lipase to access and hydrolyze triglycerides into monoglycerides and free fatty acids, which can then be absorbed by the intestinal lining.

Pancreatic Lipase

Pancreatic lipase is an enzyme secreted by the pancreas that catalyzes the hydrolysis of triglycerides into monoglycerides and free fatty acids. It requires the presence of bile salts for optimal activity, as the emulsification of fats by bile salts enhances the enzyme's ability to access and break down lipid molecules. This enzymatic action is vital for the digestion and absorption of dietary fats.
추천 영상:
4:46
Pancreas
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교과서 질문

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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교과서 질문

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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교과서 질문

Which of the following best describes the microscopic structure of the liver?

a. Hexagonal plates of hepatocytes surrounding a central vein with portal triads at each corner

b. Octagonal plates of hepatocytes surrounding a central artery with portal triads at each corner

c. Irregular groups of hepatocytes surrounding a central vein with bile ducts at each corner

d. Hexagonal plates of hepatocytes surrounding a portal vein with bile ducts at each corner

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교과서 질문

Which of the following statements about accessory organ secretions is not true?

a. Hepatocytes produce bile, which drains out of the liver via the common hepatic ducts.

b. Saliva contains secretory IgA and lysozyme, which play an important role in preventing the growth of pathogenic bacteria in the oral cavity.

c. Pancreatic juice contains digestive enzymes and bicarbonate ions to neutralize the acidic chyme.

d. The gallbladder produces bile, which drains out of the gallbladder via the cystic duct.

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교과서 질문

The primary hormone that triggers the secretion of pancreatic juice and bile is:

a. Gastric inhibitory peptide

b. Cholecystokinin

c. Motilin

d. Somatostatin

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교과서 질문

Which of the following is/are absorbed in the small intestine by the Na+/glucose cotransporter?

a. Glucose

b. Galactose

c. Fructose

d. Both a and b are correct

e. All of the above are correct

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