21.2 Overview Of Lymphoid Structures
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Questions and Answers

Where does the development of all bones formed elements and B-lymphocyte maturation take place?

  • Tonsils
  • Spleen
  • Thymus
  • Red bone marrow (correct)
  • Which lymphoid structure serves as a site where T-lymphocyte maturation and differentiation occur?

  • Thymus (correct)
  • Spleen
  • Red bone marrow
  • Lymph nodes
  • In which secondary lymphoid structure does the immune response get initiated against a substance in the lymph?

  • Red bone marrow
  • Tonsils
  • Spleen
  • Lymph nodes (correct)
  • Which lymphoid structure filters blood, removes aged erythrocytes and platelets, and serves as a reservoir for erythrocytes and platelets?

    <p>Spleen</p> Signup and view all the answers

    Where are clusters of lymphoid nodules found within the walls of mucosal membranes to protect against foreign substances?

    <p>Tonsils</p> Signup and view all the answers

    Which lymphoid structure protects body organs against foreign substances like the appendix?

    <p>MALT</p> Signup and view all the answers

    What are the two categories of lymphoid structures?

    <p>Primary and secondary</p> Signup and view all the answers

    What is the role of primary lymphoid structures?

    <p>To form and mature lymphocytes</p> Signup and view all the answers

    Which of the following is NOT a secondary lymphoid structure?

    <p>Thymus</p> Signup and view all the answers

    What is the primary function of secondary lymphoid structures?

    <p>To initiate an immune response</p> Signup and view all the answers

    Which of the following is considered a primary lymphoid structure?

    <p>Red bone marrow</p> Signup and view all the answers

    Which of the following is NOT listed as a component of the lymphatic system?

    <p>Liver</p> Signup and view all the answers

    Which of the following is considered a primary lymphoid structure?

    <p>Red bone marrow</p> Signup and view all the answers

    Which lymphoid structure serves as a site where T-lymphocyte maturation and differentiation occur?

    <p>Thymus</p> Signup and view all the answers

    Where are clusters of lymphoid nodules found within the walls of mucosal membranes to protect against foreign substances?

    <p>Mucosa-associated lymphoid tissue (MALT)</p> Signup and view all the answers

    Which lymphoid structure filters blood, removes aged erythrocytes and platelets, and serves as a reservoir for erythrocytes and platelets?

    <p>Spleen</p> Signup and view all the answers

    What are the two categories of lymphoid structures?

    <p>Primary and secondary lymphoid structures</p> Signup and view all the answers

    Where does the development of all blood formed elements and B-lymphocyte maturation take place?

    <p>Red bone marrow</p> Signup and view all the answers

    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?

    <p>Thymus</p> Signup and view all the answers

    Where are clusters of lymphoid nodules found within the walls of mucosal membranes to protect against foreign substances?

    <p>Gastrointestinal tracts</p> Signup and view all the answers

    Which lymphoid structure filters lymph and serves as the site where the immune response is initiated against a substance in the lymph?

    <p>Lymph nodes</p> Signup and view all the answers

    In which secondary lymphoid structure does the immune response get initiated against a substance in the blood, while also removing aged erythrocytes and platelets?

    <p>Spleen</p> Signup and view all the answers

    Where can you find clusters of lymphoid nodules within the oral cavity and pharynx to protect against inhaled and ingested substances?

    <p>Tonsils</p> Signup and view all the answers

    Which lymphoid structure, located near the left upper quadrant of the abdomen, wraps partially around the stomach and functions by filtering blood?

    <p>Spleen</p> Signup and view all the answers

    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

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    Description

    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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