lymphatic system Flashcards
(15 cards)
function difference between immune and lymphatic system
immune: collection of proteins cells etc that are distributed through and protect the body
lymph: transport system for immune system cells and antigens to move around the body
what is lymph made out of
solutes from plasma and cells
lymph capillaries function, permeability valves and location
form the lymph and carry it away from tissues
more permeable than blood capillaries
epithelium overlap to form one-way valves
found everywhere except nervous system, bones, avascular tissue
lacteals
lymph capillaries in intestinal mucosa, absorb fat as chyle (fatty lymph)
lymph general pathway and appearance
lymph capillaries, lymph vessels (beaded appearance due to valves), trunks, ducts, veins, heart
lymph nodes distributed throughout to filter lymph
right lymphatic and thoracic duct and where do they empty into
right: lymph from right arm, right thorax, right head
thoracic: everywhere else, arises from the cisterna chyli
both drain into the junctions between the subclavian and internal jugular veins, into the brachiocephalic vein, into superior vena cava
function of primary and secondary lymphoid tissue
produce lymphocytes, where lymphocytes are exposed to antigen and activated to fight infection
bone marrow and thymus function, thymus life cycle
haemopoiesis occurs, all blood components are produced and mature except for T lymphocytes, go to thymus to mature
reaches max size at puberty, then degrades
2 types of secondary lymphoid tissue
capsulated vs non capsulated (surrounded by CT)
lymph node structure
cortex consisting of germinal centres for B lymphocyte proliferation, medulla with network of reticular fibres made my reticular cells, more afferent than efferent vessels
lymph node function and relation to cancer
remove pathogens in lymph via phagocytosis and site of proliferation for lymphocytes
cancerous cells often are held in lymph nodes, possible to spread througout body if it enters circulatory system
tonsils 3 types and function
protection against pathogens in the oral and nasopharynx
palatine, pharyngeal, linguinal
spleen structure location and function
left hypochondriac region, 25% lymphatic tissue, 75% RBC and macrophages network
immune responses to protect blood
destroys defective RBCs
regulates blood volume
MALT SALT
mucosa associated, skin associated
homeostasis with immune system and cardiovascular system
houses and transports immune cells
returns ECF from capillary bed to veins
