System Function: Lymphatic & Immune - Massage and Bodywork Licensing Examination Mblex

1. Which T cell subtype coordinates immune responses by activating B cells and macrophages?

   Helper T cells (CD4$^+$). They release cytokines to stimulate other immune cells and enhance overall response coordination.

2. Which areas drain into the right lymphatic duct?

   Right head/neck, right thorax, and right upper limb. These regions represent the right upper quadrant, draining into the smaller right duct.

3. Which two major lymphatic ducts return lymph to the venous circulation?

   Right lymphatic duct and thoracic duct. These ducts collect lymph from all body regions and empty it into subclavian veins.

4. What is the primary function of the spleen in the lymphatic and immune systems?

   Filter blood and remove aged RBCs; mount immune responses to blood-borne antigens. As the largest lymphoid organ, it performs hematologic filtration and immune surveillance in blood.

5. Which venous angle receives lymph from the right lymphatic duct?

   Right venous angle (right subclavian–internal jugular junction). It receives lymph from the right upper body quadrant into the right venous system.

6. Which areas drain into the thoracic duct?

   All regions not drained by the right lymphatic duct. It handles lymph from the lower body, left side, and viscera, making it the largest duct.

7. What feature of lymphatic capillaries allows one-way entry of fluid, proteins, and pathogens?

   Overlapping endothelial "mini-valves" with anchoring filaments. These structures open under increased interstitial pressure to permit entry while preventing backflow.

8. Which venous angle receives lymph from the thoracic duct?

   Left venous angle (left subclavian–internal jugular junction). It drains the majority of the body's lymph into the venous system on the left side.

9. In a lymph node, what is the correct direction of lymph flow: afferent vs efferent vessels?

   Afferent enters; efferent exits at the hilum. Lymph enters via multiple afferent vessels for filtration and exits through fewer efferent vessels.

10. What is the thymus primarily responsible for in immune system development?

    T-lymphocyte maturation and selection. It educates immature T cells to recognize self-antigens and eliminate autoreactive ones.

11. Which cells differentiate into macrophages after leaving the bloodstream?

    Monocytes. They exit blood vessels and mature into tissue macrophages for long-term phagocytosis.

12. What is the difference between innate and adaptive immunity?

    Innate is immediate/nonspecific; adaptive is specific with memory. Innate provides rapid, general defense, while adaptive develops targeted responses and immunological memory.

13. Which cells are the primary phagocytes that are first responders in acute inflammation?

    Neutrophils. As the most abundant leukocytes, they quickly migrate to infection sites for phagocytosis.

14. Which lymph node region primarily contains T lymphocytes?

    Paracortex. This deep cortical area houses T cells for cell-mediated immune responses and antigen presentation.

15. Which vessels transport dietary fats from the small intestine into the lymphatic system?

    Lacteals. Located in intestinal villi, they absorb chylomicrons and transport them via the lymphatic system.

16. Which lymphatic structures are the microscopic blind-ended vessels that begin lymph flow?

    Lymphatic capillaries. These vessels absorb interstitial fluid due to their highly permeable, thin-walled structure in tissues.

17. What are tonsils primarily responsible for in immune defense?

    Trap pathogens from air and food at the pharynx. As mucosa-associated lymphoid tissue, they sample and respond to antigens entering via mouth and nose.

18. Which spleen tissue is lymphoid tissue involved in immune function: red pulp or white pulp?

    White pulp. This lymphoid tissue surrounds central arteries and contains T and B cells for immune activation.

19. Which lymph node region primarily contains B lymphocytes and germinal centers?

    Cortex (lymphoid follicles). This outer region supports B cell proliferation and antibody production in response to antigens.

20. What is the main function of lymph nodes?

    Filter lymph and initiate immune responses. They trap antigens and pathogens, allowing resident lymphocytes and macrophages to respond effectively.

21. Which immune cells are most directly responsible for antibody production?

    Plasma cells (differentiated B lymphocytes). Upon activation by antigens, B cells differentiate into these antibody-secreting cells.

22. Which T cell subtype directly kills virus-infected and tumor cells?

    Cytotoxic T cells (CD8$^+$). They recognize MHC I-presented antigens and induce apoptosis via perforin and granzymes.

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