What's the role of lymp?

Tissue fluid drainag: Interstitial fluid which lies in the interstices of all body tissues is collected through lymph capillaries; then transported though lymph vessels to lymph nodes before emptying into the subclavian vein, where it mixes back with blood. Lymph returns protein and excess interstitial fluid to the circulation. Lymph may pick up bacteria metastatic cancer cells can be transported via lymph.