Transcript Lymphatic system- Lawson Parisx

By Ian Paris and Ashley Lawson
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Three main purposes
provided by system:
Fluid and protein
balance: Collects fluid
and returns it to
circulatory system
Immunity and spread of
infection: It is the first
line of defense again
disease
Digestion: Absorbs fat
from food in
digestion(2)
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Main function is to aid in
fluid balance.
Lymphatic Vessels keep
left over interstitial fluid
from building up
The vessels act as drains
that collect the excess fluid
and return it and lymph to
the blood just before it
reaches the heart through
a lymphatic pump.
If left over fluid is left for
even a short amount of
time the result can be
massive edema or
swelling resulting in
tissue destruction or
death.(2)
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The vessels also help
with homeostasis
They remove large
molecular substances
that can’t be absorbed
by blood capillaries and
return accumulated
protein back to blood.
Lymphatic Vessels in
the small intestine
called lacteals absorb
fats and other
nutrients(1)
Function of Lymph Nodes:
 Provides defense against harmful forces by
filtration and phagocytosis
 Sinus channels in lymph nodes slow lymph
flow giving cells time to remove
microorganisms and other damaging particles
from lymph.(1)
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Tonsils are masses of
lymphoid tissue located in a
protective ring under mucous
membranes in mouth and
back of throat.
Function of tonsils: Help
protect against bacteria
invading tissue in area around
openings between oral and
nasal cavities.
Serves as first line of defense
from exterior infection and
disease.
Main job is to keep pathogens
from ever getting into our
body through our mouth or
nose. (1)
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Thymus is an unpaired
organ consisting of two
pyramid-shaped lobes.
Function of Thymus: Is final
site of lymphocyte
development before birth.
Soon after birth the thymus
starts secreting a group of
hormones called thymosin
that enable lymphocytes to
develop into mature T-cells.
T-cells are just lymphocyte
cells produced by thymus
gland that participate in
immune response.(3)
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The spleen is located under
the diaphragm
Functions of Spleen:
Defense: macrophages
remove microorganisms
from blood and destroy them
through phagocytosis.
Hematopoiesis: monocytes
and lymphocytes complete
development and become
active in spleen
Before birth red blood cells
are developed in spleen.
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Red blood cell and platelet
destruction: macrophages
remove worn-out red blood
cells and defective platelets
from blood and destroy them
through phagocytosis.
Iron and globin are taken
from destroyed red blood
cells and returned to blood
stream for storage in bone
marrow and liver.
Blood Reservoir: Blood is
stored in pulp of spleen in
case of hemorrhage.
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General: It doesn’t attack
anything specific
Example: skin blocks
everything that is trying to
enter the body.
Response: If bacteria does
enter the body then
damaged cells signal for
increased blood flow. This
increases body temperature
that creates an unfavorable
environment and delivers Tcells which are supposed to
get rid of damaged cells and
dead bacteria. (1)
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Specific: Attacks specific
types of infections
Example: Vaccination that
forms antibodies that create
an immunity to the infection.
Response: Antibodies are
created and delivered to
infected areas to destroy a
specific type of infection.(1)
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Active: A person develops a
disease and acquires an
immunity to it.(ex. measles as
a child)
Injection of a contributing
agent results in immunity. (ex.
vaccination for polio)
Passive: Baby receives
protection from mother
through placenta in womb or
an infant receives protection
from disease causing agents
from mother’s milk.
Injection of antibodies that
were developed by someone
else's immune system.
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http://www.cayugacc.edu/people/web_pages/greer/biol204/ly
mphatic1/lymphatic1.htm
http://www.lymphaticresearch.org/main.ph
p?menu=about&content=lymphsys
http://www.google.com/#hl=en&biw=1260&
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