Final answer:
The assertion that lymph nodes drain directly into both the blood and lymphatic systems is false. Lymph nodes filter lymph that enters through afferent vessels and exits through efferent vessels, ultimately draining into the subclavian veins, not directly from the nodes themselves.
Step-by-step explanation:
The statement that the lymph node drains via both the blood and lymphatics is false. Lymph nodes are an integral part of the lymphatic system; they filter lymph but do not directly drain blood. Lymph nodes receive lymph through afferent lymphatic vessels where it is filtered, and then it exits through efferent vessels. The lymphatic system and cardiovascular system interact in such a way that the filtered lymph eventually enters the bloodstream, but not directly from the lymph nodes.
The filtered lymph from the right side of the head, thorax, and right upper limb is channeled into the right subclavian vein through the right lymphatic duct. Conversely, lymph from the rest of the body drains into the left subclavian vein via the thoracic duct. Both ducts ensure that lymph rejoins the circulatory system, although not directly through the lymph nodes themselves.