Ch. 23 The Digestive System

Marieb - Human Anatomy & Physiology 7th Edition

Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook

Marieb, Hoehn 7th Edition

Ch. 23 The Digestive System

Problem 25

Chapter 22, Problem 25

Explain why fatty stools result from the absence of bile or pancreatic juice.

Verified step by step guidance

Understand the role of bile and pancreatic juice in digestion: Bile, produced by the liver and stored in the gallbladder, emulsifies fats, breaking large fat globules into smaller droplets. Pancreatic juice contains lipase, an enzyme that breaks down these smaller fat droplets into fatty acids and glycerol for absorption.

Recognize that without bile, fat emulsification is impaired: Without bile, fats remain in large globules, which reduces the surface area available for pancreatic lipase to act upon, leading to inefficient fat digestion.

Consider the absence of pancreatic juice: Without pancreatic lipase, even emulsified fats cannot be broken down into absorbable molecules, so fats remain intact and cannot be absorbed by the intestinal lining.

Connect the impaired digestion and absorption to the presence of fat in stools: Since fats are not properly digested and absorbed, they remain in the intestinal lumen and are excreted in the feces, resulting in fatty stools (steatorrhea).

Summarize that fatty stools indicate malabsorption of fats due to the lack of bile and/or pancreatic enzymes, highlighting the importance of these secretions in normal fat digestion and absorption.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Role of Bile in Fat Digestion

Bile, produced by the liver and stored in the gallbladder, contains bile salts that emulsify fats, breaking large fat globules into smaller droplets. This process increases the surface area for pancreatic enzymes to act on, facilitating efficient fat digestion and absorption.

Function of Pancreatic Juice in Fat Digestion

Pancreatic juice contains lipase, an enzyme essential for breaking down triglycerides into fatty acids and glycerol. Without pancreatic lipase, fats cannot be properly digested, leading to their accumulation in the intestines and subsequent excretion in stools.

Cause of Fatty Stools (Steatorrhea)

Fatty stools, or steatorrhea, occur when fats are not digested or absorbed due to the absence of bile or pancreatic enzymes. Undigested fats remain in the intestine, increasing stool fat content, making stools bulky, pale, and foul-smelling.

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