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33.2 The Lymphatic System
List three different types of PAMPs.
Excess fluid can be absorbed byLymphatic capillaries and returned to the bloodstream.
The lacteals in the small intestine absorb fats and transport them to the bloodstream.
The production and distribution oflymphocytes help defend the body against diseases.
Excess fluid is taken up byLymphatic capillaries.
Lymph is the fluid inside the capillaries.
Excess fluid from the tissues is returned to the cardiovascular system byLymphatic vessels.
The enlarged vessels show that they have valves to prevent backward flow.
The red bone marrow is one of the main lymphoid organs.
Before entering either the right or the thoracic duct, the lymphatic vessels join to form.
The left subclavian vein is the location of the larger thoracic duct.
The subclavian vein is the location of the right lymphatic duct.
The construction of cardiovascular veins is similar to that of the larger lymphatic vessels.
A number of diseases can result in an increased amount of fluid leaving the blood capillaries or an insufficient return of fluid to the blood via the lymphatic vessels.
The bone marrow and the thymus are places where some lymphocytes are activated.
Red bone marrow contains blood cells.
T cells mature in the body.
The red bone marrow is a major primary lymphoid organ and is a tissue where hematopoietic stem cells divide and produce all the types of blood cells.
Red bone marrow can only be found in the bones of the skull, the sternum, the ribs, the clavicle, the pelvic bones, and the vertebral column in an adult.
T cells are a type of immune system cells.
B cells remain in the red bone marrow until they are mature.
The immature migrate from the bone marrow to the thymus via the bloodstream.
The soft, bilobed thymus is a primary lymphoid organ located between the trachea and the sternum.
T cells learn to recognize the combinations of self-molecules and foreign molecule in the thymus, and this recognition characterizes mature T-cell responses.
The thymus is the largest in children and shrinks as we get older.
When well developed, it has a lot of lobules.
They enter the bloodstream once they are mature.
They migrate into the secondary lymphoid organs from there.
In this area, foreign molecule or cells can be encountered and become activated.
Like a squadron of highly trained military personnel, activated lymphatics return to the bloodstream to look for signs of inflammation.
ovoid structures are found along the lymphatic vessels.
They are a major part of the body.
Any foreign debris and pathogens are taken care of by the resident phagocytic cells.
The foreign materials can be presented to T cells in the lymph node by these phagocytes.
Sometimes called lymph glands, the lymph nodes are named for their location.
Inguinal and axillary lysies are located in the groin and armpits, respectively.
Doctors feel for the presence of swollen, tender lysies as evidence that the body is fighting an illness.
When a person undergoes surgery for cancer, it's a good idea to remove some of the sputum to make sure the cancer hasn't spread to other parts of the body.
The red pulp in the spleen filters and cleans the blood.
There are blood vessels and sinuses in the red pulp.
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