Multiple Choice
In the context of secondary lymphoid organs, what does MALT (mucosa-associated lymphoid tissue) refer to anatomically?
20. The Lymphatic System
Secondary Lymphoid Organs: MALT
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Which of the following structures is not considered mucosa-associated lymphoid tissue (MALT)?
A
Tonsils
B
Spleen
C
Peyer's patches
D
Appendix
Verified step by step guidance1
Understand the concept of Mucosa-Associated Lymphoid Tissue (MALT): MALT is a collection of lymphoid tissues that protect the mucosal surfaces of the body, such as those in the digestive, respiratory, and urogenital tracts.
Identify the structures that are considered part of MALT: Common examples include the tonsils, Peyer's patches, and the appendix, which are all associated with mucosal surfaces.
Recognize the function of the spleen: The spleen is an organ involved in filtering blood, recycling iron, and mounting immune responses, but it is not directly associated with mucosal surfaces.
Differentiate between MALT and other lymphoid organs: MALT is specifically associated with mucosal surfaces, whereas the spleen is a systemic lymphoid organ not directly linked to mucosal immunity.
Conclude that the spleen is not considered MALT because it does not have a direct role in protecting mucosal surfaces, unlike the other structures listed.
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