LYMPATHIC SYSTEM Flashcards
components of the lymphatic system
lymph, lymphatic vessels, lymphatic tissues, lymphatic nodules, lymph nodes, tonsil, spleen, thymus
main functions of the lymphatic system
- fluid balance
- lipid absorption
- defense
how much fluid passes from the capillaries into the interstitial fluid each day?
30L
volume of fluid from the interstitial fluid that passes back to the capillaries
27L
build up of fluid in the body’s tissues due to the extra 3L of fluid, causing tissue damage and eventual death
edema
the term for the 3L fluid when it enters the lymphatic capillaries, passes through the lymphatic vessels where it is circulated back to the blood
lymph
two sources of lymph
- substances from plasma
- substances from cells
lymphatic vessels that absorbs lipids and other substances from the digestive tract
lacteals
term for the lymph that passes through the lacteals; classified by its white coloration due to the lipid content
chyle
two organs that filters the microorganisms and other foreign substances from the lymph and the blood
lymph: lymph nodes
blood: spleen
OVERVIEW: LYMPHATIC SYSTEM
- lymphatic capillaries remove fluid from tissues, becomes lymph
- lymph flows through lymphatic vessels(backflow prevented by valves)
- lymph nodes filter lymph; lymph nodes and spleen are the areas where lymphocytes respond to infection
- filtered lymph enters the thoracic duct or right lymphatic duct, then enters the blood
- lacteals absorb lipids in the intestine, transforms into chyle
- chyle enters the blood, blood is then filtered in the spleen
OVERVIEW: MIGRATION OF T AND B LYMPHOCYTES
- t and b cells are developed from the stem cells in the red bone marrow
- pre b-cells mature in the red bone marrow; t-cells migrate and mature in the thymus
- matured b and t-cells enter and populate all lymphatic tissues where they remain or pass through and return to the blood
- b and t-cells divide to respond to infections (clonal selection)
present in majority of all body tissue except: CNS, bone marrow, tissue lacking blood vessels; collects extra interstitial fluid
lymphatic capillaries and vessels
the lymphatic organs
spleen, thymus, tonsils, and lymph nodes
houses the lymphocytes and other defense cells; found in the lymphatic organs
lymphatic tissue
forms a delicate supporting fibers for highly cellular tissues; composed mainly of type III collagen
reticular (reticulin) fibers
3 groups of tonsil
- paired palatine tonsils
- pharyngeal tonsils
- lingual tonsils
located on both sides of the posterior opening; branded as “the tonsils”
paired palatine tonsils
located at the top, near the internal opening of the nasal cavity
pharyngeal tonsils
enlargement of the pharyngeal tonsils that interferes with breathing
Adenoid
located in the posterior surface of the tounge
lingual tonsils
removal of the pharyngeal tonsils
tonsillectomy
removal of the lingual palatine tonsils
adenoidectomy
superficial or deep; rounded structures that varies from small seed to almond
lymph nodes
