What Is Creatinine? Creatinine is a chemical waste product in the blood that passes through the kidneys to be filtered and eliminated in urine. The chemical waste is a by-product of normal muscle function. The more muscle a person has, the more creatinine they produce. Levels of creatinine in the blood reflect both the amount of muscle a person has and their amount of kidney function.
The lymph system and lymphoid tissue. To know what lymphoma is, it helps to understand the bodyâs lymph system. The lymph system (also known as the lymphatic system) is composed mainly of lymphoid tissue, lymph vessels, and a clear fluid called lymph.Lymphoid tissue includes the lymph nodes and related organs that are part of the bodyâs immune and blood-forming systems, such as the spleen and bone marrow.ymphocytes. Lymphoid tissue is made up of several types of immune system cells that help the body fight infections. Most of the cells in lymphoid tissue are lymphocytes, a type of white blood cell. The main types of lymphocytes are B lymphocytes (B cells) and T lymphocytes (T cells).
Â« Prev 86of101 Next Â». Lymph nodes, lymph, and lymphatic vessels comprise the lymphatic system of the body. Lymph nodes filter lymph, a clear, sticky fluid that bathes body cells and collects waste products and debris. Lymph also carries white blood cells, which are responsible for protecting the body against viruses and bacteria and may trap cancer cells. Lymph nodes are located throughout the body but the largest groupings are found in the neck, armpits, and groin areas. Swollen lymph nodes may be a sign that the body is dealing with an infection, injury, or cancer.