The Starling hypothesis states that under normal conditions there is a state of near equilibrium of the mean forces determining what?

The Starling hypothesis pertains to the movement of fluid across capillary membranes, specifically addressing the forces that govern this exchange. Under normal physiological conditions, the Starling forces, which include hydrostatic pressure and colloid osmotic pressure, achieve a state of equilibrium. This equilibrium dictates the net movement of fluid into and out of the capillaries, influencing how blood plasma is exchanged with the interstitial fluid.

The hydrostatic pressure pushes fluid out of the capillaries, while the colloid osmotic pressure draws fluid back into them. The balance of these forces is crucial for maintaining proper fluid volumes in the tissues and ensuring that nutrients and waste products are adequately exchanged between blood and surrounding cells.

In summary, the correct choice reflects the essence of the Starling hypothesis as it specifically addresses capillary dynamics, which are pivotal for understanding physiological processes such as edema formation, nutrient delivery, and waste removal in various tissues.