The Immune System

The immune system, the cells and tissues that recognize and attack foreign substances in the body, provides the body's specific defenses. The immune system fights pathogens and helps to stop the growth and spread of cancers. The immune system is made up of several tissues and white blood cells. The components of the immune system, shown in Figure 47-5, are found throughout the body. The tissues include the bone marrow, thymus, lymph nodes, spleen, tonsils, and adenoids. The white blood cells of the immune system are called lymphocytes (LIM-foh-sietz).

Each part of the immune system plays a special role in defending the body against pathogens. Bone marrow, the soft material found inside long bones, such as the femur, makes the billions of new lymphocytes needed by the body every day. The thymus, a gland located above the heart, helps produce a special kind of lymphocyte.

- Adenoid

- Tonsil

Lymph nodes

Lymph vessels

Bone marrow (in femur)

Lymph nodes

Lymph vessels

Bone marrow (in femur)

Thymus

Spleen

Thymus

Spleen

How To Bolster Your Immune System

How To Bolster Your Immune System

All Natural Immune Boosters Proven To Fight Infection, Disease And More. Discover A Natural, Safe Effective Way To Boost Your Immune System Using Ingredients From Your Kitchen Cupboard. The only common sense, no holds barred guide to hit the market today no gimmicks, no pills, just old fashioned common sense remedies to cure colds, influenza, viral infections and more.

Get My Free Audio Book


Post a comment