Multiple Choice
What lymphatic structures trap bacteria in the posterior oral cavity?
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20. The Lymphatic System
Secondary Lymphoid Organs: The Spleen
3:16 minutesProblem 9
Textbook Question
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.
Verified video answer for a similar problem:This video solution was recommended by our tutors as helpful for the problem above
Video duration:
3mKey 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
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