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Saturday, June 24, 2017

Lymphatic system immune system

Lymphatic System Immune System


The Lymphatic System

The lymphatic system is composed of lymph vessels, lymph nodes, and organs. The functions of this system
include the absorbtion of excess fluid and its return to the blood stream, absorption of fat
(in the 
villi of the small intestine) and the immune system function.
Lymph vessels are closely associated with the circulatory system vessels. Larger lymph vessels are similar to
veins. Lymph capillaries are scatted throughout the body. Contraction of skeletal muscle
causes movement of the lymph fluid through valves.


Lymph organs include the bone marrow, lymph nodes, spleen, and thymus. Bone marrow contains tissue
that produces 
lymphocytes. B-lymphocytes  B-cells  mature in the bone marrow. T-lymphocytes T-cells  mature in the thymus gland. Other blood cells such as monocytes and leukocytes are
              produced in the bone marrow. 


The spleen serves as a reservoir for blood, and filters or purifies the blood and lymph fluid that flows through it.
If the spleen is damaged or removed, the individual is more susceptible to infections.


The lymphatic system is a system of capillaries, vessels, nodes.
and other organs that transport a fluid called lymph from the tissues as it returns to the bloodstream.

The lymphatic system also transports fatty acids from the intestines to the circulatory system.

T lymphocytes. T lymphocytes, also commonly known as T cells, are cells involved in fighting specific pathogens in the body.

lymphocytes. B lymphocytes, also commonly known as B cells, are also cells involved in fighting specific
pathogens in the body.
Once B cells have been activated by contact with a pathogen, they form plasma cells that produce antibodies. 


Immunity
              
Immunity is the body's capability to repel foreign substances and cells. The nonspecific responses are the first line of defense. Highly specific responses are the second line of defense and are tailored to an individual threat. 

The immune system is associated with defense against disease-causing agents, problems in transplants and blood transfusions, and diseases resulting from over-reaction autoimmune, allergies and under-reaction AIDS.

The immune system is our body’s defense system against infectious pathogenic viruses, bacteria, and fungi as well as parasitic animals and protists. 

The immune system works to keep these harmful agents out of the body and attacks those that manage to enter.

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