The Lymphatics Flashcards
the lymphatic system returns _____ to _____
extracellular fluid
bloodstream
3 extracellular fluids
plasma
interstitial fluid
lymph
plasma
seeps through capillary walls
interstitial fluid
plasma that has seeped through the capillary walls and circulates among the body tissue
lymph
when interstitial fluid drains out of the tissue and enters the lymphatic ducts
seeps through capillary walls
plasma
plasma that has seeped through the capillary walls and circulates among the body tissue
interstitial fluid
when interstitial fluid drains out of the tissue and enters the lymphatic ducts
lymph
how is lymphatic system different to circulatory (3)
no pump
one direction
lymph nodes
capillaries are blind-ended structures in the _____
interstitial spaces
capillary walls consist of
a single endothelial layer
lymph travels superficial -> deep -> ____ -> _____ -> ____
nodes
towards chest
bloodstream
nodes are an important component of the _____ system
RE
nodes are ___ shaped accumulations of ___
bean (ovoid)
lymph tissue
node size
1mm to 1-2cm
nodes surrounded by
connective tissue capsule
afferent vessels drain into node, carry lymph through ____ that are lined with _____
sinuses
phagocytic cells
phagocytic cells in afferetn vessels function
filter out/destroy bacteria and malignant cells
germinal centers in node produce and empty into what/when
produce lymphocytes
empty into lymph prior to leaving the node
which vessels only ___enter/exit___ node at hilum
efferent only exit at hilum
lymph nodes are a common side of primary infection T/F
F usually secondaru
major node bearing areas in the retroperitoneum
iliac/hypogastric
aorta/IVC
3 other lymphatic tissue
tonsils
thymus
spleen
4 key clusters of nodes
axillary
cervical
inguinal
intestinal
what is the cluster of nodes in the intestines known as
Peyer’s patch
what are the 2 vessels lymph ultimately drain into and what part of body do they drain
Rt lymphatic duct: drain RUQ
thoracic duct: remaining 3/4 of body
lymph is _____ fluid formation
extracellular
lymph is similar to plasma except it has ____ and ____
higher albumin
small # leukocytes/no erythrocytes
lymph are _____ enzymes
digestive
lymph flow is slow under resting conditions T/F
T
what does lymph flow depend on
kneading action of muscles and valves
4 functions of lymph system
phagocytosis
immunity
drainage
excretion
common sites for lymph nodes (scanning) (6)
para-aortic
para-caval
around panc
renal/splenic hilum
porta hepatis
along iliac vessels
are lymph nodes seen in the abdomen typically
no
size of lymph nodes in abdomen
<1cm
lymph nodes are ____ (echotexture) and have ____ echoes
homogenous
low level
enlarged para-aortic nodes may mimic a ____
aneursym
