Answer
A Lymph node is a somewhat pea-shaped body with a convex and a concave side. Lymph is brought to a lymph node by afferent lymph vessels which enter the lymph node on the convex side. After lymph has passed through a lymph node, it leaves by way of efferent lymphatics. The relationship of afferent vessels and efferent vessels is not equal, for there are more afferent vessels bringing lymph to the lymph node than there are efferent vessels to remove it . Consequently, the flow of lymph node is very slow , though the stasis obviously does not create a problem . In fact it seems to be an advantage.
Work Step by Step
Lymph enters lymph nodes through afferent lymphatics. It passes from the subcapsular sinus , flows slowly through the medullary sinuses towards the concave side of the lymph node ( the hilum). Efferent lymphatics transport the lymph from the lymph node. There are fewer efferent lymphatics than afferent lymphatics, that is why the passage of lymph is very slow. This obviously has some advantage , or there probably would have been evolutionary adjustments.
