- Components of the immune system
- Definition and classification of immunity
- Antigen
- Antibody
- Antigen –antibody reaction
- Immunodeficiency disorders
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| Immune System |
Components of the Immune system
- White blood cells
- Antibodies
- Complement system
- Lymphatic system
- Spleen
- Bone marrow
- Thymus.
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| Immune System |
White blood cells
- White blood cells are the key players in your immune system. They are made in your bone marrow and are part of the lymphatic system.
- White blood cells move through blood and tissue throughout your body, looking for foreign invaders (microbes) such as bacteria, viruses, parasites and fungi. When they find them, they launch an immune attack.
- White blood cells include lymphocytes (such as B-cells, T-cells and natural killer cells), and many other types of immune cells.
Antibodies
Antibodies help the body to fight microbes or the toxins (poisons) they produce. They do this by recognizing substances called antigens on the surface of the microbe, or in the chemicals they produce, which mark the microbe or toxin as being foreign. The antibodies then mark these antigens for destruction. There are many cells, proteins and chemicals involved in this attack.
Complement system
The complement system is made up of proteins whose actions complement the work done by antibodies.
Lymphatic system
The lymphatic system is a network of delicate tubes throughout the body. The main roles of the lymphatic system are to:
- manage the fluid levels in the body
- react to bacteria
- deal with cancer cells
- deal with cell products that otherwise would result in disease or disorders
- absorb some of the fats in our diet from the intestine.
The lymphatic system is made up of:
- lymph nodes (also called lymph glands) -- which trap microbes
- lymph vessels -- tubes that carry lymph, the colorless fluid that bathes your body's tissues and contains infection-fighting white blood cells
- white blood cells (lymphocytes).