4.6 Flashcards
(4 cards)
1
Q
A
junction bw single cells making capillary is not very tight so fluid + some molecules can be pushed out to make tissue fluid
1. at aerial end - HP>OP so fluid forced out - inc O2, glucose, WBCs, but prevents RBCs + large proteins
2. at venous end - HP< OP as no P from heartbeat, lower vol in capillary so water diffuses back in via osmosis
2
Q
what 2 factors affect formation of tissue fluid
A
- oncotic pressure = constant, plasma proteins + RBCs exert an osmotic effect - gives blood relatively constant +low water potential of -3.2kpa
- hydrostatic pressure = from residual heartbeat
3
Q
what happens to tissue fluid thats not reabsorbed
A
- drains into lymph capillaries - water - less o2 lots of fatty acids
4
Q
how does lymph fluid move around body
A
in 1 way, have valves move thru contraction of muscles
