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Differentiate between afferent vessel and efferent vessel? what is function of each?
Lymphatic vessels, or simply lymph vessels, are tubular structures responsible for carrying lymph throughout the human body, much as blood vessels convey blood. These vessels are a vital part of the lymphatic system, which supports the human immune and circulatory systems, filters toxins and waste products from somatic cells and tissues, and aids in the production of certain protein molecules. The lymphatic system has a one-way cycle that moves lymph upwards through the human body.Efferent vessels are the vessels leading back out of the node at the concave side called the hilum. The node itself is only about the side and shape of a bean. The outer surface of the node is called the capsule. Inside the node there is a cortex and a medulla. The outer cortex has follicles created out of B cells. The inner portion of the cortex contains T cells. The medulla surrounds the cortex and provides the sinuses that allow the lymph to flow through the node. The sinuses of the medulla contain macrophages.
 There are two kinds of lymphatic vessels, afferent lymph vessels and efferent lymph vessels. The afferent vessels are similar to veins in that they transport fluid into the lymph nodes, while the efferent vessels are similar to arteries, carrying filtered lymph away from the lymph nodes.

Functions :
The B cells, T cells and macrophages in the lymph nodes are all types of specialized white blood cells that are designed to fight infection. These cells are in high concentration in the lymph nodes to clean pathogens from the lymph that were collected from the tissue fluid before the lymph is returned to the circulatory system. In this way lymph nodes are a vital part of the immune system.


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