Lymphatic System Flashcards
List the functions of the lymphatic system
- collects interstitial fluid
- transports dietary fats
- protects against microorganisms
Explain the process of interstitial fluid collection
collects interstitial fluid not absorbed by capillary beds and returns the fluid back to the blood
-about 15% of filtered fluid
Explain how transportation works in the lymph system
transports dietary lipids and lipid soluble vitamins from the gastrointestinal tract to the blood
Explain how the body protects against foreign invaders
-protects against invasion of micro-organisms through immune responses
List the components of the lymphatic system
- Lymph capillaries, vessels, and ducts
- associated with lymphatic organs containing leukocytes
how does lymph get around the body?
same as the return of blood in veins. Skeletal muscles pump, respiratory pump, and pressure differences
List the components of interstitial fluid
- dietary lipids
- lipid soluble vits
- lymphocytes
Where is lymph located
forms at capillary beds
How does lymph form at capillary beds?
The reabsorption rate of fluid does not quite equal the amount of fluid filtered from the blood. The excess remains as interstitial fluid and is drawn into lymphatic capillaries
What is significant about the lymphatic capillaries within small intestine
takes up large lipid molecules that can’t diffuse into blood capillaries
What can move into lymph capillaries
Pathogens, which is why leukocytes are present in lymph
What are the 2 components of the lymphatic system
Lymphatic Vessels
Lymphatic Tissues
List the different types of lymphatic vessels
- capillaries
- vessels
- ducts
List the different types of lymphatic tissue
- Thymus
- lymph nodes
- spleen
- tonsils
- other lymphatic tissue aggregations
List the names of the strucutres of the lymph system
A. Lymph Duct
B. Lymph Node
C. Lymph Capillary
D. Lymph Vessel
E. Valve
Describe Lymphatic capillaries
- smallest lymph vessel
- found within capillary beds of most tissue
- blind end vessel lymph can only travel in 1 direction
- thin walled - simple squamous epithelium
- flap like valves allow interstitial fluid to be pulled in but not able to backflow
What are lymphatic vessels
resemble veins in structure but have thinner walls and more valves
What are lymph ducts?
The 2 largest lymph vessels thoracic and right lymph duct
What is the role of the lymph ducts
- collect lymph from lymph vessels and return it to the blood
- joins up with the left and right subclavian veins
What is the role of the left lymph duct
receives lymph from the left side of the head, neck, chest, left upper limb, and the entire body below the ribs
what is the role of the right lymph duct
- drains the right side of the head, neck, chest, and arm
Name the lymphatic vessels and structures
a. right lymphatic duct
b. Lymphatic Vessel
c. thoracic duct
d. thoracic duct
e. left subclavian vein
f. right subclavian vein
g. Thymus
h. cervical node
i. intestinal node
j. inguinal node
k. axillary node
l. Spleen
where is the thymus located?
posterior to the sternum, medial to the lungs, and superior to the heart
what is the role of the thymus
site of T lymphocyte maturation
