The table below shows the properties of a capillary compared with the surrounding tissue fluid:
Property |
Capillary |
Tissue fluid |
Oncotic pressure (kPa) |
3.3 |
0.04 |
Hydrostatic pressure (kPa) |
3.6 |
0.12 |
The net movement of fluid between the capillary and tissue fluid is dependent on the net driving force (Jv), which is calculated using the formula:
Jv = (Pc - Pi) - σ (πc - πi)
Where:
Pc = capillary hydrostatic pressure
Pi = tissue fluid hydrostatic pressure
Ï€c = capillary oncotic pressure
Ï€i = tissue fluid oncotic pressure
σ = reflectance factor
The reflectance factor is a measure of how permeable the capillary is to the protein albumin and varies between 0 (totally permeable) and 1 (totally impermeable).
In the capillary described above, the reflectance factor was found to be 0.65. Which of the values below correctly states the calculated net driving force?