D2-3 The Lymphatic System

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					D2-3: The Lymphatic System
September 8, 2010
The Lymphatic System
• This system is a collection of organs whose
  primary function is to collect extracellular fluid
  and return it to the blood.

• The main organs in this system include:
  ▫   Bone Marrow
  ▫   Lymph nodes
  ▫   Thymus
  ▫   Spleen
  ▫   Tonsils
I. Vessels of the Lymphatic System
• Lymphatic capillaries are similar to blood
  vessels except they absorb:

 ▫ Some of the fluid lost by the blood vessels
 ▫ Dead cells
 ▫ Pathogens

• These fluids and particles are known as lymph.
I. Vessels of the Lymphatic System
• Lymphatic vessels carry lymph
  throughout the body and
  eventually drain into the large
  neck veins of the
  cardiovascular system.

• Both the lymphatic and the
  cardiovascular systems work
  together to return fluids to the
  body as well as fight against
  pathogens with WBCs.
     II. Other Parts of the Lymphatic
• God also designed our bodies to have specialized
  Lymphatic organs.

• These again include:
 ▫   Bone Marrow
 ▫   Lymph Nodes
 ▫   Thymus
 ▫   Spleen
 ▫   Tonsils
A. Bone Marrow
• As we talked about in our
  previous chapter, marrow is
  very important in the
  formation of red blood cells
  and white blood cells.

• Lymphocytes are a type of
  white blood cells that can help
  your body to fight pathogens
  and other viruses.
B. Lymph Nodes
• As lymph travels through its vessels they stop at
  lymph nodes.
 ▫ These are small, bean-shaped masses of tissue
   that remove pathogens and dead cells from the

 ▫ They contain two types of lymphocytes:
    Killer T cells: Surround and destroy pathogens
    B cells: Produce antibodies that attach to pathogens
     that clump up and are destroyed by other cells.
B. Lymph Nodes
• When bacteria or pathogens
  cause an infection, WBCs
  make their “rallying battle

• WBCs will multiply to fight off
  the infection in your body.

• The result it that your lymph
  nodes will often swell up and
  ▫ You, your parent, and your
    doctor can actually feel the
    result of this if you are sick.
C. Thymus
• The main gland of the
  lymphatic system.

• It produces mature T
  lymphocytes, which are ready
  to fight off infection.

• It is located behind the
  breastbone, just above the
D. Spleen
• This is the largest lymphatic

• As blood flows through it,
  lymphocytes attack and mark
  pathogens in the blood.

• It also produces, monitors,
  stores, and destroys blood cells.

• As RBCs are squeezed through
  the spleen the old cells are
  destroyed and can often be
  “recycled” into new blood cells.
D. Spleen
• The spleen has two important          • Answer:
    1.       White Pulp                   ▫ Yes
              Produces WBCs to fight     ▫ The spleen can sometimes be
               infection.                   damaged or removed.
                                          ▫ Other organs inside our
    2.       Red Pulp                       bodies will take over the
              Removal of damaged or        functions of the spleen.
               defective RBCs             ▫ An amazing gift from God!!!

•    Is it possible to live a healthy
     life without your spleen?
E. Tonsils
• Small, rounded masses of
  lymphatic tissue located in the
  pharynx (throat)and in the
  passage from the mouth to the

• Lymphocytes found in the
  tonsils can fight pathogens
  that enter the throat and
E. Tonsils
• Conditions that may result
  from tonsils:
  ▫ Swelling
      May swell with fight
      Difficulty swallowing
  ▫ Strep throat
      Tonsils that are infected and
       covered with patches of
  ▫ Tonsillitis
      Infected tonsils
      Difficulty breathing
      Surgery may be needed with
       frequent infections
E. Tonsils

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