Lymphatic Vascular System
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Questions and Answers

What is the primary function of GALT (Gut Associated Lymphatic Tissue)?

  • To store lymphocytes
  • To aid in the immune response of the gut (correct)
  • To filter lymph from the blood
  • To produce antibodies

    • Which of the following is NOT a type of MALT (Mucosa Associated Lymphatic Tissue)?

  • Lymph Node (correct)
  • BALT (Bronchus Associated Lymphatic Tissue)
  • NALT (Nasal Associated Lymphatic Tissue)
  • GALT (Gut Associated Lymphatic Tissue)

    • Where are lymphatic nodules typically found?

  • In the spleen
  • In the thymus
  • In the lymph nodes
  • In structures associated with the alimentary canal (correct)

    • What is the primary function of the thymus?

    <p>To mature and select T-lymphocytes</p> Signup and view all the answers

    Which of the following is an example of a secondary lymphoid organ?

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

    What is the term for the lymphatic tissue associated with the bronchi?

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

    What is the term for the lymphatic tissue associated with the skin?

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

    Which of the following organs is NOT part of the immune system?

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

    What is the main characteristic of the endothelium in lymph capillaries and vessels?

    <p>It is extremely thin and allows for greater permeability</p> Signup and view all the answers

    What is similar between the structure of larger lymph vessels and veins?

    <p>The structure of their walls, except the lymph vessels are thinner</p> Signup and view all the answers

    What is one of the functions of lymph vessels?

    <p>To bring lymphocytes to the systemic bloodstream</p> Signup and view all the answers

    What helps to maintain luminal patency in lymphatic capillaries?

    <p>Small lymphatic anchoring filaments</p> Signup and view all the answers

    What is the main function of B cells?

    <p>To produce antibodies and present antigens</p> Signup and view all the answers

    Where do lymphocytes originate and develop?

    <p>In the bone marrow and primary lymphoid organs</p> Signup and view all the answers

    What type of immune cells are responsible for presenting antigens to T cells?

    <p>Dendritic cells</p> Signup and view all the answers

    What is the main function of lymph vessels in terms of fluid homeostasis?

    <p>To collect and return interstitial fluid to the bloodstream</p> Signup and view all the answers

    What is the primary function of the lymphatic vascular system?

    <p>To passively collect lymph and return it to the blood vascular system</p> Signup and view all the answers

    What is the role of macrophages in lymph nodes?

    <p>To engulf and digest foreign microorganisms and suspended matter</p> Signup and view all the answers

    What is the direction of lymph flow?

    <p>Unidirectional, with lymph flowing only towards the heart</p> Signup and view all the answers

    What is the composition of lymph?

    <p>An ultrafiltrate of the blood plasma</p> Signup and view all the answers

    What is the role of the lymphatic system in regulating fluid homeostasis?

    <p>To regulate the balance of fluid between the bloodstream and interstitial spaces</p> Signup and view all the answers

    What is the function of the thoracic duct and right lymphatic duct?

    <p>To collect lymph from the lymph nodes and return it to the bloodstream</p> Signup and view all the answers

    What is the characteristic of lymph capillaries?

    <p>They are blind-ending tubules in the connective tissue</p> Signup and view all the answers

    What is the role of the lymphatic system in regulating immune response?

    <p>To activate and stimulate lymphocytes</p> Signup and view all the answers

    Study Notes

    Lymphatic Vascular System

    • The endothelium in lymph capillaries and vessels is extremely thin, allowing greater permeability.
    • The structure of larger lymph vessels is similar to that of veins, except that their walls are much thinner.
    • Lymph vessels bring lymphocytes, fatty acids, and immunoglobulins to the systemic bloodstream.

    Lymph Movement

    • Contractions of surrounding skeletal muscles force lymph to move forward.
    • Lymph vessels contain more valves to prevent a backflow of collected lymph.
    • Lymph vessels are found in all tissues except the central nervous system, cartilage, bone, bone marrow, thymus, placenta, and teeth.

    Lymphatic Capillaries

    • Lymphatic capillaries are thin-walled vessels that begin as blind-ended channels adjacent to capillary beds, where they collect lymph.
    • They are composed of a single layer of attenuated endothelial cells that lack fenestrae and fasciae occludentes.
    • They possess a sparse basal lamina.
    • Lymph enters these leaky capillaries via spaces between overlapping endothelial cells.
    • Small lymphatic anchoring filaments between the surrounding connective tissue and the abluminal plasma membrane assist in maintaining luminal patency in these delicate vessels.

    Lymphocytes

    • Lymphocytes can be classified into three major types based on their immunologic functions: B lymphocytes (B cells), T lymphocytes (T cells), and Null cells.
    • B cells and T cells are the two main cell types found in lymphoid organs.
    • Lymphocytes originate in the bone marrow and develop and mature in primary lymphoid organs.

    Immune Cells

    • Other immune cells include macrophages, monocytes, neutrophils, eosinophils, basophils, dendritic cells, and Langerhans cells.
    • B cells are both antigen-presenting and antigen-receiving cells.

    Lymphatic Tissue

    • Diffuse lymphatic tissue, GALT (Gut Associated Lymphatic Tissue), MALT (Mucosa Associated Lymphatic Tissue), BALT (bronchus-associated lymphatic tissue), and lymphatic nodules are types of lymphatic tissue.
    • Lymphatic nodules are usually found in structures associated with the alimentary canal, such as the tonsils, ileum, and vermiform appendix.

    Tonsils

    • Pharyngeal tonsils, palatine tonsils, and lingual tonsils are types of tonsils.
    • Tonsils are composed of lymphatic tissue.

    Organs of the Immune System

    • Primary lymphoid organs: thymus and bone marrow.
    • Secondary lymphoid organs: lymph nodes, spleen, MALT, GALT, NALT, BALT, CALT, and urogenital tract.

    Functions of the Lymphatic System

    • Collects plasma continuously leaking out from blood vessels into the interstitial spaces and returns it to the blood (after filtration).
    • Regulates both immune and fluid homeostasis.
    • Passively collects lymph, excess tissue fluid, and proteins from the intercellular spaces of the connective tissue and returns it into the venous portion of the blood vascular system.
    • Lymph is a clear fluid and an ultrafiltrate of the blood plasma.
    • Numerous lymph nodes are located along the route of the lymph vessels, where they filter the lymph and engulf any foreign microorganisms and suspended matter.

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    Related Documents

    Lymphatic System Lecture Slides PDF

    Description

    Learn about the structure and function of the lymphatic vascular system, including the endothelium, lymph vessels, and lymph movement.

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