3.2.4 Tissue Fluid Flashcards
1
Q
What is tissue fluid
A
- Fewer proteins than blood (too large to fit through gaps in capillary walls)
- Bathe almost all cells in body outside of circulatory system
- Exchange of substances occurs here
2
Q
How does tissue fluid form?
A
- At arterial end of capillary, hydrostatic pressure forces liquid out of capillary
- Proteins remain in blood because they are too big to pass through capillary wall
- Increased protein content remaining in capillaries creates a water potential gradient
- Arterial end, hydrostatic is greater than osmotic pressure so net movement of fluid is out of capillaries
- At venous end, hydrostatic pressure within capillary is lower than osmotic pressure
- Water flows back into capillaries by osmosis
- 90% of fluid lost at arterial end is reabsorbed at venous end 10% goes to lymph vessels
3
Q
What is lymph
A
- Large molecules that cant pass through capillaries enter lymph system
- Lymph moves along large vessels whose flow is monitored by body movements. Backflow is prevented by valves
- Eventually reenters blood stream
4
Q
Difference between Composition of plasma and tissue fluid
A
- Higher conc of glucose in plasma
- Higher conc of glycerol and fatty acids in plasma
- Higher conc of amino acids in plasma
- Higher conc of plasma proteins in plasma
- Higher conc of O2 in plasma
- Lower conc of CO2 in plasma
- Tissue fluid contains a higher conc of substances secreted by cells ,eg. insulin