MICROANATOMY

Detailed explanation-1: -Most of the lymphatic vessels have valves like those in veins to keep the lymph, which can clot, flowing in the one direction (toward the heart). Lymphatic vessels drain fluid called lymph from tissues throughout the body and return the fluid to the venous system through two collecting ducts.

Detailed explanation-2: -After travelling through the lymph node, lymph enters efferent lymphatic vessels, flows through the downstream lymph node(s) and eventually returns to the blood circulation via the subclavian veins. Lymphocytes enter lymph node via high endothelial venule cells and move to T cell or B cell areas.