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21 Cards in this Set

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What is the primary function of the lymphatic system?
1. Production, maintenance and distribution of lymphocytes.
2. Return of fluid and solutes from peripheral tissue to the blood (3.6 liters per day)
3. The distribution of hormones, nutrients and waste products from their tissue of origin to the general circulation.
Where are lymphocytes stored and manufactured?
Spleen, Thymus and bone marrow.
What do lymphocytes respond to?
1. Invading pathogens such as bacteria or viruses; 2. abnormal body cells such asvirus-infected cells or cancer cells 3. foreign proteins such as the toxins produced by some bacteria.
What type of actions do lymphocytes use to render its defenses?
Combination of chemical and physical actions.
Name the smallest lymphatic vessel.
Lymphatic capillary
What are the primary components of the lymphatic system?
Vessels: begin in the peripheral tissues and end at the VENOUS system.
Fluid: Like plasma but with lower protein concentration.
Lymphoid organs: Lymph nodes, spleen and thymus.
What are the three classes of lymphocytes?
T-cells (thymus dependent), B-cells (bone marrow dirived) and NK (natural killer) cells.
Most lymphocytes are (blank) cells.
T-cells
What cells directly attack foreign cells or body cells infected by viruses and are primary providers of cellular immunity?
T Cells
What are the two main lymph drainage vessels?
Right lymphatic and left lymphatic duct into the right and left subclavian veins.
List the various types of "T" cells:
Cytotoxic T cells
Helper T cells
Suppressor T cells
These cells in the lymphocytes directly attack foreign cells or body cells infected by viruses and are the primary providers of cellular immunity.
cytotoxic T cells
These lymphocytes stimulate the activities of both T cells and B cells.
Helpter T cells
These lymphocytes inhibit both T cells and B cells.
Suppressor T cells
Helper T cells and suppressor T cells are also called:
Regulatory T cells
What is the role of the thymus and where is it located?
The thymus is located in the mediastinum posterior to the sternum. It is where T cells are produced and mature. The thymus cortex secretes thymosin (hormone) which stimulat stem cell divisions and T cell maturity. They leave the thymus via one of the blood vessels in that region.
What is the role of the spleen and where is it located?
The spleen is wedged between the stomach and the left kidney and muscular diaphram. It contains iron from recycled red blood cells. It functions similar to the way a lymph node does except that it filters blood instead of lymph. It initiates the responses of B cells and T cells to antigens in the circulating blood. As blood passes through the spleen, macrophages identify and engulf damaged or infected cells.
Genetically determined immunity.
Innate immunity
(Blank) immunity is not present at birth but instead arises by active or passive means.
Acquired immunity
(Blank) immunity appears after exposure to an antigen as a consequence of the immune response.
Active immunity
Innappropriate or excessive immune responses to antigens.
Allergies