1
-manages immune response
-directly attack and destroy infected cells
What are T lymphocytes
-grow in red bone marrow
-mature into T and B lymphocytes
What are lymphoid cells
Fluid contained in vessels
What is lymph
Returns fluids that leaked from blood vascular system back into blood
What is the function of the lymphatic system
Cleanses lymph as they pass through
What are lymphnodes
2. Lymphoid follicles/modules
What are types of lymphoid tissue
-found in inferior neck region
-maturation site for T lymphocytes precursors
What is the thymus
1. network of lymphatic vessels
2. Lymph
3. Lymphnodes
What are the three parts of the lymphatic system
-external physical and chemical barriers provided by skin and mucous membranes
-phagocytes, inflammation, fever
What is innate immunity
-targets particular foreign molecules
-memory for previous antigens
What is adaptive immunity
- elaborate networks of drainage vessels that collect excess fluid and put into bloodstream
- transport leaked plasma proteins and fluids to cardiovascular systems
What are lymphatic vessels
-allows vessels to be be extremely permeable
-anchors endothelial cells to surrounding structures
What are collagen filaments
1. Filtration
2. Immune System Activation
What are the two functions of lymphnodes
1. Tonsils
2. Peyer's Patches
3. Appendix
What is the mucosa associated lymphoid tissue
Located posterior wall of nasopharynx
What is the pharyngeal
Surrounds openings of auditory tubes into pharynx
What is the tubal
1. Milking action of active skeletal muscles
2. Pressure changes in thorax during breathing
3. Valves to prevent backflow
-produces plasma cells that secrete antibodies
-antibodies mark antigens for destruction by phagocytes
What are B lymphocytes
Becomes network that supports other cell types in lymphoid organs and tissues
-solid, spherical bodies consisting of tightly packed lymphoid cells and reticular fibres
What are lymphoid follicles/modules
-immune functions
-composed of lymphocytes suspended on reticular fibers
What is the white pulp of the spleen
-protects body and immune response
-phagocytize foreign substances
-activates T cells
What are macrophages
-provides a proliferation site for lymphocytes
-surveillance vantage point for lymphocytes and macrophages
What are lymphoid tissues
-located in plasma membrane
-recognizes foreign antigens which is first step to immune response
What are major histocompatibility complex antigens
-loose arrangement of lymphoid cells and reticular fibres
-found in every body organ
What are diffuse lymphoid tissue
-worn out RBC's and bloodbone pathogens are destroyed
-contain large numbers of erythrocytes
What is the red pulp of spleen
-ring of lymphoid tissue around entrance to pharynx
-gathers and removes pathogens entering pharynx or inhaled air
-contains palatine, pharyngeal, tonsil tubes
What are tonsils
-Destroys bacteria
-generates many lymphocytes for long-term immunity
What is the appendix
Lymphocytes encounter antigens and are activated to mount attack against them
-macrophages in nodes remove and destroy microorganisms /debris that enter lymph from connective tissue
-isolated from foreign antigens to prevent premature activation
-keeps blood borne antigens out of thymus
-largest lymphoid organ
-located in left side of abdominal cavity
What is the spleen
-structurally similar to tonsils
-located in small intestine (ileum)
What are Peyer's Patches
-provides a site for lymphocyte proliferation and immune surveillance and response
-blood cleansing
-stores breakdown of RBC's for later use
-holds blood platelets and monocytes for release into blood
What are the functions of the spleen
Located on the base of the tongue
What is the lingual