Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

23. The Digestive System

Small Intestine

Anatomy & Physiology

23. The Digestive System

Small Intestine

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Problem 8

Textbook Question

Regional movements that occur in the small intestine and function to churn and fragment the digestive material are called:
(a) Segmentation
(b) Pendular movements
(c) Peristalsis
(d) Mass movements
(e) Mastication

Verified step by step guidance

Understand the question: The problem is asking about a specific type of movement in the small intestine that helps to churn and fragment digestive material. This requires knowledge of digestive system physiology.

Review the options: (a) segmentation, (b) pendular movements, (c) peristalsis, (d) mass movements, (e) mastication. Each term refers to a different type of movement or process in the digestive system.

Define each term: (a) Segmentation refers to localized contractions in the small intestine that mix and fragment the contents without propelling them forward. (b) Pendular movements are a type of back-and-forth motion seen in the small intestine. (c) Peristalsis involves wave-like contractions that move contents along the digestive tract. (d) Mass movements are large, powerful contractions in the large intestine. (e) Mastication is the process of chewing in the mouth.

Match the definition to the question: The question specifies movements that churn and fragment material in the small intestine. This matches the definition of segmentation, as it involves localized contractions that mix and break down the contents.

Select the correct answer: Based on the definitions and the question's description, the correct answer is (a) segmentation.

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Key Concepts

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

Segmentation

Segmentation is a type of intestinal motility that involves rhythmic contractions of the circular muscles in the small intestine. This process helps to mix and break down food, allowing for better absorption of nutrients. Unlike peristalsis, which moves food along the digestive tract, segmentation focuses on churning the contents within a localized area.

Peristalsis

Peristalsis is a wave-like muscle contraction that moves food through the digestive tract. It involves the coordinated contraction and relaxation of longitudinal and circular muscles, pushing the contents forward. While essential for moving food along the gastrointestinal tract, peristalsis does not primarily function to churn or fragment food, which distinguishes it from segmentation.

Mastication

Mastication refers to the process of chewing food in the mouth, which mechanically breaks down food into smaller pieces. This initial step in digestion increases the surface area of food, making it easier for enzymes to act on it later in the digestive process. While important for digestion, mastication occurs before food enters the small intestine and is not a function of intestinal movements.

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Related Practice

Multiple Choice

Which of the following is true regarding the small intestine?

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Multiple Choice

What feature of the small intestine makes it uniquely suited for nutrient absorption?

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Textbook Question

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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Textbook Question

Match the letter of the digestive organ shown in the figure with its function.

___ segmentation occurs here

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Multiple Choice

The __________ is the first segment of the small intestine.

Where are bile salts reabsorbed in the small intestine?

Lactose, a sugar found in milk, can only be digested by lactase, a brush border enzyme. All babies produce lactase, but only some adults do. Adults who do not produce lactase are referred to as lactose intolerant, as the presence of undigestible lactose can lead to uncomfortable digestive side effects such as gas and diarrhea. Based on your understanding of the small intestine, where would you expect to find the most lactase in babies and those adults that can digest lactose?

How does absorption of lipids differ from absorption of carbohydrates and proteins in the small intestine?

a. Lipids are absorbed into a capillary; carbohydrates and proteins are absorbed into a lacteal.

b. Lipids are not absorbed in the small intestine.

c. Lipids are absorbed into a lacteal; carbohydrates and proteins are absorbed into a capillary.

d. They are all absorbed into the same structure.

613

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Regional movements that occur in the small intestine and function to churn and fragment the digestive material are called:(a) Segmentation(b) Pendular movements(c) Peristalsis(d) Mass movements(e) Mastication

Key Concepts

Segmentation

Peristalsis

Mastication

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Regional movements that occur in the small intestine and function to churn and fragment the digestive material are called:
(a) Segmentation
(b) Pendular movements
(c) Peristalsis
(d) Mass movements
(e) Mastication