Capillary hydrostatic and osmotic pressures are important to determining fluid movement between the blood and interstitial fluid in capillary beds. 

1. Please compare HPc and OPc in the arterial end of the capillary bed and in the venous end of the capillary bed. In this context, compare means describing which pressure is greater than the other or if pressures are equal.

2. Please describe how one of these pressures could change to promote edema. In this context, change means a specific pressure becomes higher or lower.