24 Questions
Where does the development of all bones formed elements and B-lymphocyte maturation take place?
Red bone marrow
Which lymphoid structure serves as a site where T-lymphocyte maturation and differentiation occur?
Thymus
In which secondary lymphoid structure does the immune response get initiated against a substance in the lymph?
Lymph nodes
Which lymphoid structure filters blood, removes aged erythrocytes and platelets, and serves as a reservoir for erythrocytes and platelets?
Spleen
Where are clusters of lymphoid nodules found within the walls of mucosal membranes to protect against foreign substances?
Tonsils
Which lymphoid structure protects body organs against foreign substances like the appendix?
MALT
What are the two categories of lymphoid structures?
Primary and secondary
What is the role of primary lymphoid structures?
To form and mature lymphocytes
Which of the following is NOT a secondary lymphoid structure?
Thymus
What is the primary function of secondary lymphoid structures?
To initiate an immune response
Which of the following is considered a primary lymphoid structure?
Red bone marrow
Which of the following is NOT listed as a component of the lymphatic system?
Liver
Which of the following is considered a primary lymphoid structure?
Red bone marrow
Which lymphoid structure serves as a site where T-lymphocyte maturation and differentiation occur?
Thymus
Where are clusters of lymphoid nodules found within the walls of mucosal membranes to protect against foreign substances?
Mucosa-associated lymphoid tissue (MALT)
Which lymphoid structure filters blood, removes aged erythrocytes and platelets, and serves as a reservoir for erythrocytes and platelets?
Spleen
What are the two categories of lymphoid structures?
Primary and secondary lymphoid structures
Where does the development of all blood formed elements and B-lymphocyte maturation take place?
Red bone marrow
Which lymphoid structure is an example of a primary component and is located in the superior mediastinum for adults and in the anterior and superior mediastinum for children?
Thymus
Where are clusters of lymphoid nodules found within the walls of mucosal membranes to protect against foreign substances?
Gastrointestinal tracts
Which lymphoid structure filters lymph and serves as the site where the immune response is initiated against a substance in the lymph?
Lymph nodes
In which secondary lymphoid structure does the immune response get initiated against a substance in the blood, while also removing aged erythrocytes and platelets?
Spleen
Where can you find clusters of lymphoid nodules within the oral cavity and pharynx to protect against inhaled and ingested substances?
Tonsils
Which lymphoid structure, located near the left upper quadrant of the abdomen, wraps partially around the stomach and functions by filtering blood?
Spleen
Study Notes
Lymphoid Structures
- Lymphoid structures are categorized as either primary or secondary lymphoid structures.
- Primary lymphoid structures are involved in the formation and maturation of lymphocytes.
- Secondary lymphoid structures are not involved in lymphocyte formation, but instead house lymphocytes and other immune cells following their formation.
Primary Lymphoid Structures
- Red bone marrow:
- Located in the spongy bone of selected bones
- Function: development of all blood-formed elements; site of B-lymphocyte maturation
- Thymus:
- Located in the superior mediastinum (in adults) and anterior and superior mediastinum (in children)
- Function: site of T-lymphocyte maturation and differentiation
Secondary Lymphoid Structures
- Lymph nodes:
- Located along the length of lymphatic vessels; clusters in axillary, inguinal, and cervical regions
- Function: filter lymph; site where immune response is initiated against a substance in the lymph
- Spleen:
- Located in the left upper quadrant of the abdomen, near 9th–11th ribs
- Function: filters blood; site where immune response is initiated against a substance in the blood; removes aged erythrocytes and platelets; serves as erythrocyte and platelet reservoir
- Tonsils:
- Located in the oral cavity and pharynx (throat)
- Function: protect against inhaled and ingested substances
- MALT (mucosa-associated lymphoid tissue):
- Located in clusters of lymphoid nodules within the walls of gastrointestinal (GI), respiratory, urinary, and reproductive tracts
- Function: protects mucosal membranes against foreign substances
- Lymphoid nodules:
- Located in every body organ and wall of the appendix
- Function: protect body organs against foreign substances
Learn about the two categories of lymphoid structures and their components in the lymphatic system including red bone marrow, thymus, lymph nodes, spleen, tonsils, and mucosa-associated lymphoid tissue (MALT).
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