Lymph drains into the blood of the low-pressure venous circuit at the subclavian veins.

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Quizplus · Accepted Answer

Lymphatic vessels eventually drain into the subclavian veins, where the lymph is mixed with blood and returned to the circulation. This occurs because the pressure in the lymphatic vessels is much lower than the pressure in the venous system, and therefore lymph must be assisted by things like the skeletal muscle pump to flow back towards the heart. The subclavian veins are the point of connection between the lymphatic and circulatory systems.

Lymph Drains into the Blood of the Low-Pressure Venous Circuit