How does lymph move throughout the body?

Lymph primarily moves through capillaries, specifically the lymphatic capillaries. These tiny vessels are part of the lymphatic system and play a crucial role in collecting excess interstitial fluid that accumulates in tissues. This fluid, once collected by lymphatic capillaries, becomes lymph, which is then transported through larger lymphatic vessels and eventually returned to the bloodstream via the thoracic duct or the right lymphatic duct.

The structure of lymphatic capillaries is designed to facilitate the entry of interstitial fluid, proteins, and other substances, allowing for efficient drainage of excess fluid and immune system functionality. The one-way valves within these vessels prevent backflow, ensuring that lymph flows in a unidirectional manner toward the lymph nodes and eventually to the circulatory system.

While lymph nodes play a critical role in filtering lymph and housing immune cells, they are not involved in the movement of lymph itself. Lymphatic vessels and capillaries are responsible for this transport. Thus, understanding the function and role of capillaries in lymphatic circulation is key to grasping how lymph circulates throughout the body.