Answer:
A lymph capillary serves as a one-way passage for tissue fluids, while the blood capillary serves as a place of transit for energy sources to tissues, and wastes from tissues to the blood. Lymph capillaries, however, penetrate tissues, and serves as "drains" to the lymph vessel to which they are attached. In essence, things enter and exit blood capillaries, but lymphatic capillaries are only a point of exit.