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    Chapter 3: Lymphatic System

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    fatin harris
    The lymphatic system consists of lymphatic vessels, lymph nodes, and lymph fluid. It functions to return excess tissue fluid back to the bloodstream, produce lymphocytes for the immune response, and transport absorbed fats from the intestines. The document describes the structures and functions of lymph nodes, lymph vessels, and other lymphatic organs such as the spleen, thymus, tonsils, and Peyer's patches.

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    Chapter 3: Lymphatic System

    Uploaded by

    fatin harris
    116 views22 pages
    The lymphatic system consists of lymphatic vessels, lymph nodes, and lymph fluid. It functions to return excess tissue fluid back to the bloodstream, produce lymphocytes for the immune response, and transport absorbed fats from the intestines. The document describes the structures and functions of lymph nodes, lymph vessels, and other lymphatic organs such as the spleen, thymus, tonsils, and Peyer's patches.

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    Chapter 3: Lymphatic system

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    The lymphatic system consists of lymphatic vessels, lymph nodes, and lymph fluid. It functions to return excess tissue fluid back to the bloodstream, produce lymphocytes for the immune response, and transport absorbed fats from the intestines. The document describes the structures and functions of lymph nodes, lymph vessels, and other lymphatic organs such as the spleen, thymus, tonsils, and Peyer's patches.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    116 views22 pages

    Chapter 3: Lymphatic System

    Uploaded by

    fatin harris
    The lymphatic system consists of lymphatic vessels, lymph nodes, and lymph fluid. It functions to return excess tissue fluid back to the bloodstream, produce lymphocytes for the immune response, and transport absorbed fats from the intestines. The document describes the structures and functions of lymph nodes, lymph vessels, and other lymphatic organs such as the spleen, thymus, tonsils, and Peyer's patches.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 22
    At a glance
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    The key takeaways are that the lymphatic system returns fluids leaked from blood vessels back to the bloodstream, transports fat from the intestines, and plays an important role in immunity by housing lymphocytes.

    The main functions of the lymphatic system are to return excess interstitial fluid from tissues to veins, produce and house lymphocytes for the immune response, and transport absorbed fats from the intestines to blood.

    The main components of lymph are water, proteins, blood cells, bacteria, viruses, cancer cells, and cell debris.

    BIO310 / Lymphatic / NHM

    LYMPHATIC SYSTEM
    LESSON OUTCOMES
    At the end of this chapter, you should be able to:

    1) Define the functions of lymphatic system


    2) Describe the formation of lymph
    3) Compare blood, tissue fluid and lymph
    4) Describe lymphatic vessels, ducts and lymphatic pathway
    5) Describe the structures and functions of lymph nodes
    6) Describe function of spleen, thymus, tonsils and Peyer’s
    patches

    BIO310 / Lymphatic / NHM


    Functions of the Lymphatic System

     Lymphatic system: return fluids


    that have leaked from the blood
    vascular system back to the
    blood.
     Consist of 3 parts:
    a) Network of lymphatic vessels
    b) Lymph: fluid contain in those
    vessel
    c) Lymph nodes: cleanse the
    lymph as it passes through
    them.
    BIO310 / Lymphatic / NHM
    Functions of the Lymphatic System

     Transports excess
    interstitial fluid (lymph)
    from tissues to the veins
     Produces and houses
    lymphocytes for the
    immune response
     Transports absorbed fats
    from intestines to blood

    BIO310 / Lymphatic / NHM


    LYMPHATIC CHARACTERISTICS

    Lymph (= clear water): excess


    tissue fluid carried by lymphatic
    vessels

    Properties of lymphatic vessels


    · One way system toward the heart
    · No pump
    · Lymph moves toward the heart
    - Contraction of skeletal muscle
    - Contraction of smooth muscle in vessels
    BIO310 / Lymphatic / NHM
    LYMPH
    Materials returned to the blood
    · Water
    · Proteins
    · Blood cells

    Harmful materials that enter lymph vessels


    · Bacteria
    · Viruses
    · Cancer cells
    · Cell debris
    BIO310 / Lymphatic / NHM
    Vessels of the Lymphatic System
     Lymphatic capillaries:
     Smallest; found within most organs
     Interstitial fluids, proteins,
    microorganisms, and fats can enter.

     Lymph ducts:
     formed from merging capillaries
     Similar in structure to veins
     Lymph is filtered through lymph
    nodes
    BIO310 / Lymphatic / NHM
    BIO310 / Lymphatic / NHM
    Lymph Capillaries:
    · Walls overlap - flap-like minivalves
    · Fluid leaks into lymph capillaries
    · Capillaries anchored by filaments
    · Higher press on inside closes minivalves
    BIO310 / Lymphatic / NHM
    Lymphatic Collecting Vessels

    ·Collects lymph from lymph


    capillaries
    ·Carries lymph to and away
    from lymph nodes
    ·Returns fluid to
    circulatory veins near the
    heart
    -Right lymphatic duct
    -Thoracic duct

    BIO310 / Lymphatic / NHM


    BIO310 / Lymphatic / NHM
    Lymph Nodes
    · Filter lymph before it is
    returned to the blood
    · Defense cells within lymph
    nodes
    · Macrophages – engulf and
    destroy foreign substances
    · Lymphocytes – provide immune
    response to antigens

    BIO310 / Lymphatic / NHM


    Lymph Node Structure

    · Most are kidney-shaped,


    less than 1 inch long
    · Cortex
    • Outer part
    • Contains follicles –
    collections of
    lymphocytes
    · Medulla
    • Inner part
    • Contains phagocytic
    macrophages

    BIO310 / Lymphatic / NHM


    Flow of Lymph Through Nodes

    · Lymph enters the convex


    side through afferent
    lymphatic vessels
    · Lymph flows through a
    number of sinuses inside
    the node
    · Lymph exits through
    efferent lymphatic vessels
    · Fewer efferent than
    afferent vessels causes flow
    to be slowed
    BIO310 / Lymphatic / NHM
    BIO310 / Lymphatic / NHM

    LYMPHOID ORGANS
    Organs of the Lymphatic System

     Lymphoid organs and tissues


    provide structural basis of the
    immune system.
     Play roles in body’s defense
    mechanisms.
     Include – Spleen, thymus,
    tonsils:
     Sites for lymphocyte
    production

    BIO310 / Lymphatic / NHM


    The Spleen

    · Located on the left side of the


    abdomen
    · Site for lymphocyte proliferation
    · Filters blood
    · Destroys worn out blood cells
    · Forms blood cells in the fetus
    · Acts as a blood reservoir

    BIO310 / Lymphatic / NHM


    The Thymus

    · Located low in the throat,


    overlying the heart
    · Functions at peak levels only
    during childhood
    · Produces hormones (thymosin)
    to program lymphocytes
    · Maturation site for T
    lymphocyte

    BIO310 / Lymphatic / NHM


    Mucosa-Associated Lymphatic Tissue
    (MALT)
    • Acts as a sentinal to protect
    respiratory and digestive
    tracts.

    • Includes:
    ·Tonsils
    ·Peyer’s patches
    ·Other small accumulations of
    lymphoid tissue

    BIO310 / Lymphatic / NHM


    Tonsils

    · Small masses of lymphoid


    tissue around the entrance
    of the pharynx (throat)
    · Trap and remove bacteria
    and other foreign materials
    (food and inhaled air)
    · Tonsillitis is caused by
    congestion with bacteria

    BIO310 / Lymphatic / NHM


    Peyer’s Patches

    · Found in the wall of the small intestine


    · Resemble tonsils in structure
    · Capture and destroy bacteria in the intestine

    BIO310 / Lymphatic / NHM


    THE END

    BIO310 / Lymphatic / NHM

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