Chapter 16 PPT: Lymphatic Flashcards
Three functions of lymphatic system?
Transport excess fluid away from the intersitital space and return to blood stream
Absorb lipids from digestive system and transport to bloodstream
Defends the body against diseases
Lymphatic Pathway
Lymphatic Capilaries
Lymphatic Vessels
Lymph Nodes
Larger Lymphatic Vessels
Lymphatic Trunks
Lymphatic Collecting Ducts
Subclavian Veins in Thorax
What are lacteals?
Lymphatic capillaries that absorb fats, and transport them to the blood
Lymphatic CApillaries are microscopic,
closed-ended tubes
Lymphatic Capillaries networks..
parallel blood capillaries throughout the body
Lymphatic Capillaries thickness?
Thin-Walled
Lymphatic Capillaries walls formed from
simple squamous epithelium
Lymphatic Capillaries tissue fluid enters
lymphatic capillaries, fluid is now called lymph
Lymphatic Capillaries merge into
lymphatic vessels
Lymphatic Vessels walls are similar to
veins, but thinner
Lymphatic Vessels composed of what thre layers
Endothelial Lining (Inner)
Smooth Muscle (Middle)
Connective Tissue (Outer)
Lymphatic Vessels contains
semilunar valves
Lymphatic Vessels ; Larger vessels lead to
lymph nodes and then to larger lymphatic trunks
Lymphatic trunks drain
lymph from lymphatic vessels
Lymphatic trunks named for the regions
they serve.
Examples include lumbar, intestinal, intercostal, bronchomediastinal, subclavian, and jugular
Lymphatic collecting ducts drain
lymph from trunks
What are the two lymphatic collecting ducts?
Thoracic Duct (Large) and Right Lymphatic Duct (Small)
The thoracic duct drains a much larger portion of body than
right lymphatic duct
Breast drains to
axillary lymph nodes
cancer surgery can disrupt
lymphatic flow and cause edema
The large thoracic duct drains into the
left subclavian vein near its junction with the left jugular vein
The small right lymphatic duct drains into the
right subclavian vein
Lymphatic Pathway Route
Lymphatic Capillary
Afferent Lymphatic Vessel
Lymph Node
Efferent Lymphatic Vessel
Lymphatic Trunk
Collecting Duct
Subclavian Vein
Lymph is tissue fluid that has entered
a lymphatic capillary
Lymph formation depends on
tissue fluid formation
Capillary blood pressure filters
water and small molecules form the plasma
Capillary blood pressure that has been filtered results in tissue fluid that has:
The same composition as blood plasma
COntains water and dissolved nutrients, gases, hormones
Exception: Tissue fluid does not contain large plasma proteins
Plasma proteins remain in
blood plasma to maintain osmotic pressure necessary to draw fluid back into blood capillaries
Tissue fluid =
blood plasma - plasma proteins
Filtration from the plasma normally exceeds
reabsorption, leading to the net formation of tissue fluid
lymph filtration increases the
tissue fluid hydrostatic pressure within interstitial spaces, forcing fluid into lymphatic capillaries and forming lymph
Lymph filtration prevents accumulation of
excess tissue fluid or edema
Lymph inside lymphatic vessels has low
hydrostatic pressure, l ike venous blood
Good lymphatic flow requires help from
several mechanisms