Tissue Fluid Flashcards
(3 cards)
1
Q
Formation of tissue fluid
A
- as blood enters the arterioles it is under high hydrostatic pressure
- when the blood enters the capillary this hydrostatic pressure forces small molecules to leak through the permeable wall of the capillary
- these small molecules forced out of the capillary enter the tissue fluid e.g. glucose, amino acids, CO2, urea, water
- large proteins remain inside the capillary
- hydrostatic pressure inside the capillary is greater than the osmotic pressure of the tissue fluid surrounding the capillary on the arteriole end
- the more fluid that leaves the capillary the hydrostatic pressure starts to fall
2
Q
The drainage of tissue fluid
A
- the large proteins that remain in the capillary lower the water potential inside the capillary
- this causes water to drain into the capillary from the tissue fluid via osmosis
- osmotic pressure of the fluid surrounding the capillary is greater than the hydrostatic pressure inside the capillary
- waste substances such as CO2 and urea are taken with the water back into the capillary
- which form the composition of venous blood
3
Q
Describe the lymphatic system
A
- more tissue fluid leaves the capillaries than is returned
- this extra fluid is drained back into the blood by lymphatic capillaries
- these frain into larger lymph vessels
- these vessels have valves and slightly muscular walls
- these lymphatic vessels drain into a vein in the neck
