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

20. The Lymphatic System

Overview of Lymphoid Organs

Anatomy & Physiology

20. The Lymphatic System

Overview of Lymphoid Organs

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Problem 2e

Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Clusters of MALT located around the oral and nasal cavities are known as Peyer's patches.

Verified step by step guidance

Step 1: Understand the term 'MALT' (Mucosa-Associated Lymphatic Tissue). MALT refers to clusters of lymphatic tissue found in mucosal linings throughout the body, including the respiratory, digestive, and urogenital tracts. It plays a role in immune defense.

Step 2: Learn about Peyer's patches. Peyer's patches are specialized clusters of MALT located specifically in the small intestine, particularly in the ileum. They are involved in monitoring intestinal bacteria and generating immune responses.

Step 3: Recognize the anatomical location of MALT clusters around the oral and nasal cavities. These clusters are not called Peyer's patches; instead, they are part of the tonsils, which include the palatine tonsils, pharyngeal tonsils (adenoids), and lingual tonsils.

Step 4: Evaluate the statement: 'Clusters of MALT located around the oral and nasal cavities are known as Peyer's patches.' This statement is false because Peyer's patches are located in the small intestine, not around the oral and nasal cavities.

Step 5: Correct the false statement: 'Clusters of MALT located around the oral and nasal cavities are known as tonsils, not Peyer's patches.'

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Key Concepts

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

MALT (Mucosa-Associated Lymphoid Tissue)

MALT refers to a collection of lymphoid tissues found in mucosal sites throughout the body, including the gastrointestinal tract, respiratory tract, and urogenital tract. It plays a crucial role in the immune response by protecting mucosal surfaces from pathogens. MALT includes structures such as tonsils, adenoids, and Peyer's patches.

Peyer's Patches

Peyer's patches are specialized lymphoid follicles located in the ileum of the small intestine. They are part of the gut-associated lymphoid tissue (GALT) and are essential for monitoring intestinal bacteria and generating an immune response. Unlike MALT in the oral and nasal cavities, Peyer's patches are specifically associated with the gut.

Immune System Function

The immune system is a complex network of cells and proteins that defends the body against infection and disease. It includes various components such as lymphoid tissues, antibodies, and immune cells. Understanding the role of different immune structures, like MALT and Peyer's patches, is vital for comprehending how the body responds to pathogens in different environments.

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Related Practice

Textbook Question

More than one choice may apply.

Which of the following are part of MALT?

a. Tonsils

b. Thymus

c. Peyer’s patches

d. Any lymphoid tissue along the digestive tract

Aggregates of lymphoid nodules located in the wall of the ileum of the small intestine are __________.

Carla presents to her physician with a complaint of swollen axillary lymph nodes. Her physician performs a breast exam and finds a tumor on the same side as the swollen nodes.

b. Carla undergoes surgery to have the tumor and affected lymph nodes and surrounding lymphatic vessels removed. Predict any complications Carla might have after the surgery that could arise from removal of the lymph nodes and vessels.

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Multiple Choice

A patient comes to you after experiencing multiple infections in a short period of time. Analysis reveals that she has a very low white blood cell count. Which lymphoid organ is likely not functioning correctly?

More than one choice may apply.

Developmentally, embryonic lymphatic vessels are most closely associated with the

a. Veins

b. Arteries

c. Nerves

d. Thymus gland

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