Inflamation and Swelling

Histamine and prostaglandins are the most common causes of vasodilation. Every cell in your body except the red blood cells produce MHC class one proteins. MHC class two proteins are produced by phagocytes. C3A and C3B are major inducers of histamine release, it keeps white blood cells moving through periphery. The release of a chemical causes vasodilation of the blood vessels, which increases blood flow to the injured area. The increased blood flow causes swelling and increased pressure on the nerve endings which causes pain.

Lymph Nodes

A lymph node is an organ made up of many types of cells. The lymph node is also part of the lymphatic system and are found throughout the body acting as filters to keep things that do not belong in the body out. The lymph nodes are centralized in the cervical, axillary, and inguinal. They are located close to the portages of entries. All the lymph nodes are routed through the right lymphatic duct or on the left side which is the left thoracic duct.
They are an important part of the immune system because the lymph nodes contain white body cells. When the lymph nodes become enlarged or inflamed, the conditions that this can cause can be anything from a throat infection to cancer. The lymph node is surrounded by a fibrous capsule and is divided into the outer cortex and inner medulla. Inside the lymph node, a mesh like work called RN (Reticular Network) supports the node. Not only does this mesh work support but it also provides adhesion to the cells inside.The lymph nodes allow the exchange of material with the blood.