Final answer:
The claim that lymph arrives at lymph nodes via efferent lymphatic vessels is false; it actually enters through afferent vessels and exits through efferent vessels after being filtered.
Step-by-step explanation:
The statement that lymph arrives to the lymph nodes via efferent lymphatic vessels is false. Instead, lymph enters the lymph nodes through afferent lymphatic vessels. The correct statement is that lymph enters the lymph nodes via afferent lymphatic vessels and exits through efferent lymphatic vessels. The lymph enters the lymph node via the subcapsular sinus and flows through the cortex and medulla before leaving the node via the efferent lymphatic vessels.
The entry of lymph through these afferent vessels allows for the lymph to be filtered and immunologically assessed within the lymph nodes. As lymph flows through the lymph node, it passes through various compartments such as the subcapsular sinus, the cortex with its lymphoid follicles, and the medulla. The lymphoid follicles are composed of B cells and T cells which contribute to the immune response. After the lymph has been processed within the lymph node, it exits via efferent lymphatic vessels.