Fluid exchange in the microcirculation
J_v = Lp S [ (Pc - Pi) - σ*(Πc - Πi) ]
- Pc - Pi = capillary-interstitial hydrostatic gradient
- Πc - Πi = capillary-interstitial oncotic pressure gradient
applies in GFR as well?
pressures across capillaries
- arteriole: 30-40 mmHg
- 25 mmHg in the middle
- venule: 10-15mmHg
higher in glomerular capillaries - varies by tissueFF