Flashcards in Vocab Deck (116)
3L of fluid that enter lymphatic capillaries.
Lymph contains solutes from two sources
A) substances in plasma: ions, gas, nutrients, proteins
B) substances derived from cells: hormones, enzymes, waste
Lymphatic system absorbs lipids from digestive tract. In small intestine
Lipids enter lacteals then pass into venous circulation. Lymph called chyle.
Lymphatic system includes
Lymph, lymphatic vessels, lymphatic tissue, nodules, nodes, tonsils, spleen, thymus
Begin as small, dead-end tubes
Resemble small veins.
Three major mechanisms for moving lymph
1) contraction of lymphatic vessels
2) contraction of skeletal muscles
3)thoracic pressure changes
Round, oval, bean shaped bodies. Filter lymph!!!!
Flow of lymph
Capillaries, vessels, nodes, trunk, duct
Vessels converge to form larger vessel (trunks) that drain major portion of body
Drains head and neck
Drains upper limbs, thoracic wall, mammary glands
Drain thoracic organs and deep thoracic wall
Drain abdominal organs
Drain lower limbs, pelicans and abdominal walls, ovaries, tested, kidneys, adrenal glands
Lymphatic trunks connect to form ducts
Right lymphatic duct
20% of people: three trunks join to form a short duct that joins right thoracic vein
Largest. Drains lymph from right side inferior to thorax and entire left side of body
In a some people, lymphatic trunks form a sac
Two types of lymphocytes
B cells and T cells
Makes up lymphatic tissue. Fine collagen fibers. Lymphocytes attach and filter lymph
Lymphatic tissue that is not surrounded by a connective tissue capsule
Mucosa associated lymphoid tissue
Aggregations of nonencapsulated lymphatic tissue. Found in and beneath mucous membranes lining digestive, respiratory urinary and reproductive tracts.
Examples of MALT
Diffuse lymphatic tissue, nodules, tonsils.
Lymphatic organs with a capsule
Nodes, spleen, thymus
Diffuse lymphatic tissue
Contains dispersed lymphocytes, macrophages. No clear boundary, blends in with surrounding tissues. Within nodes and spleen
Denser arrangements of lymphatic tissue. Numerous in loose connective tissue of digestive, respiratory, urinary and reproductive
Nodules in distal half of small intestine and appendix