Lecture 4A Flashcards
Blood is supplied to each capillary network by what?
Arterioles
Blood leaves the capillary network by draining into what?
Venules
What is the major function of the capillary network?
Nutrient and waste exchange with tissues
Lymph is a fluid that is: (2)
- Created in the interstitial spaces of tissues
- Put back into the circulation
T or F, Lymphatic capillaries have blind endings
True
What is one of the major functions of draining the interstitial fluid through lymphatic networks?
To prevent Edema
What is flow of lymphatic fluid through what three things?
Lymphatic capillaries–>
Lymphatic venules and veins–>
Lymphatic Ducts
Right and Left lymphatic ducts drain into what?
R/L Subclavian veins
Right –> 25% of lymph
Left –> 75% of lymph
Where are lymph nodes not extensive?
In the extremities
Cancer travels through the lymph and are not destroyed… Why not?
They are not foreign to our body
What 4 ways do we normally exchange things between the vasculature and interstitium?
- Diffusion across endothelial cell membranes (O2 & CO2)
- Movement through intracellular clefts or pores
- Movement through fenestrations
- RBC platelets proteins and WBCs cannot leave capillary
- Transport via small vesicles (pinocytosis)
Name each of the 4 Starling Forces
- Pc - Capillary hydrostatic pressure (blood pressure)
- Pi - Interstitial hydrostatic pressure
- pie-c - Capillary oncotic pressure
- pie-i - Interstitial Oncotic pressure
The thoracic duct ascends into the root of the neck on the left side and opens up into what?
The Subclavian vein near the junction of the left internal jugular vein
What is Edema? Why does it occur?
Palpable swelling due to expansion of extracellular fluid
- It occurs when the volume of interstitial fluid exceeds the capacity of the lymphatics to return it to the circulation
What four thing can cause Edema?
- Excess Filtration ( Increased Pc)
- Decreased absorption (Decreased PIEc)
- Increased capillary permeability
- Blocked lymphatics
