Lymphology Association of North America (LANA) Practice Exam

What process does recent lymphatic research indicate does not exist in normal capillaries according to Starling's Law?

1. Capillary filtration

2. Colloid osmotic pressure

3. Capillary diffusion

4. Capillary reabsorption

The correct answer is: Capillary reabsorption

The correct answer highlights that capillary reabsorption is a process not present in normal capillaries according to Starling's Law. Starling's Law describes the movement of fluid across capillary membranes, balancing filtration (the movement of fluid out of the capillaries) and reabsorption (the movement of fluid back into the capillaries). In the context of normal capillaries, fluid movement primarily occurs through the filtration process, driven by hydrostatic pressure, while colloid osmotic pressure aids in reabsorbing fluid back into the capillary. However, in normal physiological conditions, it is primarily the filtration that occurs, and not reabsorption. Most of the fluid filtered out does not return to the capillary; instead, it enters the interstitial space, where lymphatic vessels then collect and transport the excess fluid. Understanding this concept is essential in lymphology, as it underscores the role of the lymphatic system in maintaining fluid balance and the limitations of capillary dynamics in tissue fluid homeostasis. This knowledge is critical for accurately assessing conditions related to lymphatic function, edema, and fluid management in clinical practice.