What does the LS collect?
Collects excess interstitial fluid and leaked blood proteins then delivers them to the circulatory system
What is the effect does the LS have on the Circulatory System?
Effect - keeps osmotic pressure of the interstitial fluid low
Fluid that is mostly water and leaked blood protein is what type of fluid
lymph fluid - which is the same as interstitial fluid - once enters lymphatics the fluid is renamed to lymph fluid
Lymphoid and Lymphatic Tissue is composed of what tissue?
Composed of reticular connective tissue with large numbers of lymphocytes (T&B), macro-phages, fibroblasts
A large phagocytic cell found in stationary form in the tissues or as a mobile white blood cell, esp. at sites of infection
Lymphatic tissue dominates all lymphoid organs except the thymus, diffusely found in all body organs such as...
larger collections found in mucous membranes and supporting tissue; serves as proliferation site for lymphocytes; provides surveillance area for lymphocytes and macrophates
Structure of Lymphoid Follicles (nodules) are oval-shaped...
Unencapsulated oval-shaped concentrations of lymph tissue cortex and medulla
Lymph nodes are tightly packed spherical bodies located in?
Located - superficial/cortex: reticular tissue and T cells; deep (germinal center - B) Medulla B cells and dendritic cells
Dendritic Cell type of macrophage
A special type of cell that is a key regulator of the immune system, acting as a professional antigen-presenting cell (APC) capable of activating T cells and stimulating the growth and differentiation of B cells.
What tissue type is found in the Lymph nodes and aggregations of follicles?
Mucosa-Associated Lymphoid Tissue )MALT)
Mucosa Associated Lymphoid tissue is located deep to mucosa protects what upper respiratory and gi tracts from pathogens?
Tonsils, pharyngeal - adenoids, lingual, stomach, peyers patch, apendix
Nodes are oval in structure and surround by a capsule many are embedded in what connective tissue?
cervical, axillary and inguinal areas
Nodes function is to produce lymphocytes and to filter the lymph
Macrophages in nodes remove and destroy microbes and other debris (filter) present antigens to lymphocytes
The spleen structure consist of red and white pulp what are they?
red pulp all remaining splenic tissue, white lymphocytes suspended on reitcular fibers
Spleen performs 3 related functions....
1 - stores the breakdown products of red blood cells for later use
2 - stores blood platelets
3 - erythrocyte production in the fetus
Spleen functions to remove, add surveillance and store...
removes old RBC, destoys old RBCs, stores iron and platelets
Thymus has two encapsulated lobes each with...
cortex and medulla
cortex- tightly packed lymphocytes
medulla - epithelial cells and scattered lymphocytes
Pressure in the vessels are low and need pumps from...
muscular and respiratory pump plus pulsations of neighboring arteries for assistance
Lymph vessels have negative pressure generated during
generated during inspiration pulls lymph toward the thoracic cavity
smooth muscles in the walls of what trunks and duct help move lymph
lymphatic trunks and thoracic duct
Lymph capillaries is where flow begins its is blind-ended
slightly larger and more permeable that blood capillaries
Similar in structure to veins, same three tunics, connected to lymph nodes, thinner and more internal valves are?
Lymphatic collecting vessels
Lymphatic collecting vessels
lymphatic vessels the capillaries, collecting vessels, and trunks that collect lymph from the tissues and carry it to the blood stream
Role of Lymphatic ducts
Right duct - drains right arm, right side of head and thorax, empties into right subclavian vein, at the right jugular vein
Left duct - drains lymph from remainder of the body, lumbar trunks and intestinal trunk drain at first lumbar vertebra, empties into the left subclavian vein at the left jugular