Lymphatic system Flashcards
A small bean-shaped organ located in the lymphatic system is called a ____ ____.
Lymph node
Deep lymphatic vessels of the viscera generally follow the same routes as what structures?
Arteries
B-lymphocytes mature in the ____
Bone marrow
What are tonsils important for?
Developing immunity to oral pathogens
Briefly describe the purpose of the spleen
To filter the blood
Briefly describe the structure of the lymphatic system
Lymph vessels begin as open-ended capillaries, which feed into increasingly larger lymphatic vessels, which eventually empty into the bloodstream by a series of ducts
Blood pressure causes leakage of fluid from the ____.
Capillaries
What prompts endothelial cell flaps in lymphatic capillaries to close?
Low interstitial pressure
Which lymph nodes receive lymph from the lower limbs?
Inguinal lymph nodes
Yellow bone marrow is a site for what?
Energy storage, consisting largely of adipocytes
The right sides of the head, thorax, and upper right limb drain lymph fluid into what location?
The confluence of the right subclavian and right internal jugular veins
A major function of the lymphatic system is the drain body fluids from the ____ space and return them to the ____.
Interstitial; bloodstream
Where is the spleen located?
Against the thoracic diaphragm in the left upper abdominal quadrant
Which lymphocytes mature in bone marrow?
B-lymphocytes
Childen who suffer recurring throat infections may have their ____ tonsils removed
Palatine
What is the result of fluid leakage from capillaries?
Accumulation of fluid in the interstitial space
Approximately how many lymph nodes are in the human body?
500 - 600
The lymphatic system is closely tied to the ____ system.
Immune
Briefly describe what occurs in the primary lymphoid organs
Lymphocytes mature, proliferate, and are selected
What prevents lymph flowing backward or pooling at the lowest point of gravity?
One-way semi-lunar valves in lymphatic vessels
What are lymphoid follicles?
Germinal centres comprised of lymphocytes; a mass of lymphocytes “ready to go”
Which lymph nodes receive lymph from the gastrointestinal tract?
Mesenteric lymph nodes
In which tracts are lymphoid nodules found?
Respiratory and digestive tracts
Do lymphocytes inititate immune responses from primary lymphoid organs?
No - lymphocytes develop and mature in primary lymphoid organs, but they mount immune responses from secondary lymphoid organs