Lymph nodes filter substances that travel through the lymphatic fluid, and they contain lymphocytes (white blood cells) that help the body fight infection and disease. There are hundreds of lymph nodes found throughout the body.
The nodes filter out the damaged cells and cancer cells. These lymph nodes also produce and store lymphocytes and other immune system cells that attack and destroy bacteria and other harmful substances in the fluid. You have about 600 lymph nodes scattered throughout your body.Feb 23, 2020
Lymph nodes produce and maintain the lymphocytes of blood. These are only found in the mammals. Lymph nodes filter the blood and remove poisonous and foreign substances, e.g., bacteria, debris, etc.Mar 18, 2018
Lymph nodes trap microorganisms and antigens which get into lymph and tissue fluid. Antigens trapped in the lymph nodes are responsible for the activation of lymphocytes present in lymph nodes. Thus, they trigger the immune response as well.
When lymph nodes become infected, they usually increase in size, become tender, and may be felt in other areas of your body during a physical exam. Infections that spread to lymph nodes are usually caused by bacteria, a virus, or a fungus.
Lymph nodes can also swell after an infection because immune responses to infections are generated in lymph nodes. Sometimes, bacteria that are carried to a lymph node are not killed and cause an infection in the lymph node (lymphadenitis).
Lymph is a colorless fluid collected from tissues in most parts of the body and returned to the blood via the lymphatic system. It is about 95% water. Its composition is similar to plasma of blood, but contains less protein. Lymph mainly contains white blood cells (mainly lymphocytes).Jul 5, 2019
When naïve lymphocytes first encounter antigen in the secondary lymphoid tissues, they mount a primary immune response, generating both effector and memory cells.
Lymphocytes develop in the thymus and bone marrow (yellow), which are therefore called central (or primary) lymphoid organs. The newly formed lymphocytes migrate from these primary organs to peripheral (or secondary) lymphoid organs (more...)
The lymph nodes filter out harmful substances and waste products. They also contain immune cells called lymphocytes that destroy cancer cells and bacteria. The filtered fluid is then returned to the blood circulation.