d2-3: the lymphatic system september 8, 2010. the lymphatic system this system is a collection of...
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D2-3: The Lymphatic SystemSeptember 8, 2010
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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
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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.
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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.
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II. Other Parts of the Lymphatic System
•God also designed our bodies to have specialized Lymphatic organs.
•These again include:▫Bone Marrow▫Lymph Nodes▫Thymus▫Spleen▫Tonsils
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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.
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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 lymph.
▫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.
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B. Lymph Nodes• When bacteria or pathogens
cause an infection, WBCs make their “rallying battle cry.”
• WBCs will multiply to fight off the infection in your body.
• The result it that your lymph nodes will often swell up and ache.▫ You, your parent, and your
doctor can actually feel the result of this if you are sick.
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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 heart.
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D. Spleen• This is the largest lymphatic
organ.
• 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.
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D. Spleen• The spleen has two
important functions:1. White Pulp
Produces WBCs to fight infection.
2. Red Pulp Removal of damaged
or defective RBCs
• Is it possible to live a healthy life without your spleen?
• Answer:
▫ Yes▫ The spleen can
sometimes be damaged or removed.
▫ Other organs inside our bodies will take over the functions of the spleen.
▫ An amazing gift from God!!!
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E. Tonsils• Small, rounded masses of
lymphatic tissue located in the pharynx (throat)and in the passage from the mouth to the pharynx.
• Lymphocytes found in the tonsils can fight pathogens that enter the throat and lungs.
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E. Tonsils• Conditions that may result
from tonsils:▫ Swelling
May swell with fight infection
Difficulty swallowing▫ Strep throat
Tonsils that are infected and covered with patches of white.
▫ Tonsillitis Infected tonsils Difficulty breathing Surgery may be needed
with frequent infections
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E. Tonsils