A positive Jv value in the Starling equation signifies that:

A positive Jv value in the context of the Starling equation indicates that fluid is moving from the capillaries to the tissue. The Starling equation describes the movement of fluid across capillary membranes based on the balance of hydrostatic and oncotic pressures. When Jv is positive, it means that the hydrostatic pressure within the capillaries exceeds the opposing forces exerted by osmotic pressure and tissue hydrostatic pressure, facilitating the filtration of fluid out of the capillaries and into the interstitial tissues. This process is crucial for nutrient delivery and waste removal in tissues.

The other options refer to scenarios that imply fluid movement either back into the vessel or remaining stationary, which does not align with the interpretation of a positive value for Jv. In this case, a positive value clearly signifies the process of filtration from the capillaries to the tissue, representing the dynamic exchange of fluids in the circulatory system.