Questions and Answers
Which of the following are primary lymphoid organs? (Select all that apply)
Which of the following areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes?
Where in the lymph node do the T cells first encounter antigens presented by dendritic cells?
Deep in the cortex
Collections of lymphoid tissues, called MALT, are strategically placed throughout the respiratory, digestive, and genitourinary systems. Which one of these is located at the end of the small intestine?
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There is a decrease in our ability to fight infection as we age. Which lymphoid organ may have a role in this decline?
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What is the function of the mini-valves in lymph capillaries?
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Once collected, lymph ultimately drains into __________.
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Which of these lymphoid organs is part of a collection of tissues called the mucosa-associated lymphoid tissues (MALT) and removes pathogens entering the pharynx?
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Which lymphoid organ is primarily active during the early years of life?
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Which part of the spleen is the site of immune function?
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Which lymphoid organ(s) serve(s) as the site where B lymphocytes become immunocompetent B cells?
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After surgical removal of the spleen (i.e., a splenectomy), some organs take over most of its functions. Which of the following spleen functions in the adult cannot be performed by bone marrow?
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Which of the following is a role of lymph nodes?
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Lymphedema may be treated by all EXCEPT which of the following?
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Which of the following promotes closure of the mini-valves associated with lymph capillaries?
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Within buboes, bacteria are directly attacked by ______.
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Which lymphoid organ(s) serve(s) in immune surveillance and blood cell recycling?
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Select the correct statement about lymphoid tissue.
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Study Notes
Primary Lymphoid Organs
- Bone marrow and thymus are the primary lymphoid organs responsible for the development and maturation of lymphocytes.
Secondary Lymphoid Organs
- White pulp of the spleen provides a site for close interaction between blood and lymphocytes.
Antigen Encounter in Lymph Nodes
- T cells first encounter antigens presented by dendritic cells deep in the cortex of lymph nodes.
Mucosa-Associated Lymphoid Tissue (MALT)
- Peyer's patches, located at the end of the small intestine, are a form of MALT.
Age-Related Immune Decline
- The thymus may play a role in the declining immune function associated with aging.
Function of Mini-Valves in Lymph Capillaries
- Mini-valves increase permeability, allowing greater fluid uptake in lymph capillaries.
Drainage of Lymph
- Collected lymph ultimately drains into venous circulation for systemic re-entry into the bloodstream.
Function of Tonsils
- Tonsils are part of MALT and play a key role in removing pathogens that enter through the pharynx.
Thymus Activity
- The thymus is most actively engaged in lymphocyte development during the early years of life.
Immune Function of the Spleen
- Immune functions of the spleen are primarily conducted in the white pulp.
B Lymphocyte Immunocompetence
- Red bone marrow serves as the site for B lymphocytes to mature into immunocompetent B cells.
Spleen Functions Post-Splenectomy
- After splenectomy, bone marrow cannot perform the function of removing aged and damaged red blood cells from circulation.
Role of Lymph Nodes
- Lymph nodes filter lymph, removing pathogens and foreign particles.
Lymphedema Treatment Options
- Manual compression, movement, and treatments promoting lymphatic vessel growth can help treat lymphedema, but bed rest is not effective.
Closure of Mini-Valves
- Increasing pressure inside the lymph capillary promotes the closure of mini-valves, regulating lymph flow.
Response to Infections
- Within swollen lymph nodes (buboes), macrophages actively attack bacteria.
Immune Surveillance and Blood Cell Recycling
- The spleen is responsible for immune surveillance and recycling of blood cells.
Characteristics of Lymphoid Tissue
- Lymphoid tissue is primarily made up of reticular connective tissue, essential for its function in immunity.
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Description
Test your knowledge on primary and secondary lymphoid organs with these flashcards from Chapter 20. Explore key terms and their definitions to strengthen your understanding of the lymphatic system.
