The walls of lymphatic capillaries are composed of endothelium. Fluid flows in one direction in lymphatic capillaries. Lymphatic capillaries are dead-end tubes. Lymphatic capillaries are highly permeable.

Answer: Lymphatic capillaries are dead-end tubes.

Explanation: Lymphatic capillaries are closed tubes with flap-like valves that open to take in tissue fluid. Blood capillaries are part of a continuous system of blood vessels; arterioles supply blood to the capillary bed, and venules drain them.