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23 Cards in this Set
- Front
- Back
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Describe the function (Purpose of the lymph vessels?
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-The production maintence and distribution of lymphocytes
-teh return of fluid and solutes from peripheral tissues to the blood. -the distribution of hormones nutrients and waste products from their tissue origin to the general circulation. |
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what tissue lines lymphatic capillaries?
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simple squamous epithelium
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Why are fluids and solutes as well as viruses, bacteria and cell debris able to flow into lymphatic capillarys
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there is no basement membrane around the endothelium.
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What prevents backflow of fluid in lymphatic capillaries into intercellular spaces
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overlaping arrangement of endothelial cells acts as a one way valve.
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Describe the pressure within the lymphatic system/
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Extreamly low
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Are there valves in lymphatic vesels?
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Yes; valves are essential to maintaining normal lymph flow because theh pressure is so low.
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Describe T cells and their functions?
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-approximatelt 80% of circulating lymphocytes are T (thymus-dependent) cells
- Cytotoxic T cells directly attack foreigh cells or body cells infected by viruses. -Helper T cells stimulate the activity of both T and B cells. -Suppressor T cells inhibit both T cells and B cells. Helper T cells and suppressor T cells are also called regulatory T cells. |
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Describe B cells and their functions?
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B cell (bone marrow-derived) cells make up 10 to 15% of circulating lymphocytes. B cells can differentiate into plasma cells, which produce and secrete antibodies also called immunogloblins. Antibodies bind to specific chemical targets called antigens
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What percent of circulating white blood cell population is Lymphocytes?
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10 to 30 percent.
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about how many Lymphocytes does the body contain?
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aproximatily 1,000,000,000,000
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Which cell type has the greatest concentration
T cells B cells NK cells |
T cells roughly 75%
B cells roughly 10% NK cells roughly 15% |
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Where do lympocytes reside?
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- Seend some time in blood
- Spend more time in Spleen - Spend most time in lymph nodes. |
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What is the process of lymphocyte production called?
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Lymphopoiesis
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Where does lymphopoiesis take place?
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Lymphopoiesis takes place initialy in bone marrow. Stem cells migrate to othere lymphoid tissues and continue production there.
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what playes a roll in determining differentation of specific lymphocytes?
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Cytokines
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What is a immunoglobins and do B cells produce them?
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B cells differentiate into plasma cells that produce immunoglobulins they are circulating antibody.
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What is on the surface of memory cells?
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immunogloblins
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Plasma cells produce and secrete these?
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immunoglobulins
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From what, where, and how does the lymph fluid drain?
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The thoracic duct collects lymph from the lower abdomen, pelvis, and lower limbs and from the left half of the head neck and chest. It empties its collected contents into the left subclavian vein.
- the right lymphatic duct delivers lymph from the right sid eof teh body abov ethe diaphram and empties into the right subclavian vein. |
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Can the receptos on T cells detect antigens?
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NO
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What defines the different classes of T cells?
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Proteins on the surface
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Why do lymphnodes swell?
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because a cell idintifed an antigon and started making more antibodies toe fighe the antigen.
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Define Hilus
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a shallow depression in one side of a lymph node through which blood vessels pass and efferent lymphatic vessels emerge
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