Textbook Question
The lymphoid organ that functions primarily during youth and then begins to atrophy is:
a. Spleen
b. Thymus
c. Palatine tonsils
d. Bone marrow
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Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System10
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton11
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity28
- Ch. 14 The Autonomic Nervous System18
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart22
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses29
- Ch. 22 The Respiratory System20
- Ch. 23 The Digestive System30
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System25
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System23
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Not the one you use?Change textbook
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Marieb, Hoehn 7th EditionCh. 20 The Lymphatic System and Lymphoid Organs and TissuesProblem 9
Marieb, Hoehn 7th EditionCh. 20 The Lymphatic System and Lymphoid Organs and TissuesProblem 9Chapter 19, Problem 9
Collections of lymphoid tissue (MALT) that guard mucosal surfaces include all of the following except:
a. Appendix follicles
b. The tonsils
c. Peyer's patches
d. The thymus
Verified step by step guidance1
Step 1: Understand what MALT (Mucosa-Associated Lymphoid Tissue) is. MALT consists of lymphoid tissues that protect mucosal surfaces such as those in the respiratory, digestive, and urogenital tracts.
Step 2: Identify the examples of MALT given in the options: Appendix follicles, tonsils, and Peyer's patches are all known collections of lymphoid tissue associated with mucosal surfaces.
Step 3: Recall the function and location of the thymus. The thymus is a primary lymphoid organ involved in T-cell maturation and is not associated with mucosal surfaces.
Step 4: Compare each option to the definition of MALT. Since the thymus is not part of the mucosa-associated lymphoid tissue, it does not belong in the list of MALT collections.
Step 5: Conclude that the correct answer is the option that is not part of MALT, which is the thymus.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Mucosa-Associated Lymphoid Tissue (MALT)
MALT refers to collections of lymphoid tissue found in mucosal linings of the body, such as the digestive, respiratory, and urogenital tracts. These tissues play a key role in immune defense by detecting and responding to pathogens at mucosal surfaces.
Recommended video:
0:49
Secondary Lymphoid Organs: MALT Example 1
Examples of MALT Structures
Common examples of MALT include the tonsils, Peyer's patches in the small intestine, and lymphoid follicles in the appendix. These structures contain immune cells that help protect mucosal surfaces from infection.
Recommended video:
2:31Introduction to MALT
Thymus and Its Role
The thymus is a primary lymphoid organ responsible for T cell maturation, not a MALT structure. Unlike MALT, it is located in the chest and does not directly guard mucosal surfaces, making it distinct from other lymphoid tissues listed.
Recommended video:
5:05Introduction to the Thymus
Related Practice
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Compare the structure and functions of a lymph node to those of the spleen.
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The germinal centers in lymph nodes are largely sites of:
a. Macrophages
b. Proliferating B lymphocytes
c. T lymphocytes
d. All of these
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A friend tells you that she has tender, swollen 'glands' along the left side of the front of her neck. You notice that she has a bandage on her left cheek that is not fully hiding a large infected cut there. Exactly what are her swollen 'glands,' and how did they become swollen?
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Textbook Question
The red pulp areas of the spleen are sites of:
a. Splenic sinusoids, macrophages, and red blood cells
b. Clustered lymphocytes
c. Connective tissue septa
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