The body's defense

The human body is made up of ten systems that work together to help it do all that is needed. A system is a collective functional unit of organs that work in coordination with each other. Each system works with other systems for the effective functioning of the body. These systems are:
Digestive system
Circulatory system
Urinary system
Muscular system
Skeletal system
Nervous system
Respiratory system
Reproductory system
Endocrine system and
Lymphatic system
The lymphatic system works with the circulatory system to transport part of the blood known as lymph. Functioning in defence, it is called the immune system. The immune system protects the body from disease by detecting the presence of foreign bodies and destroying or barring them. Subsystems of the immune system are the innate immune system and the adaptive immune system. Innate immune system is the first line of defence for the body; it functions through mechanisms such as phagocytosis, action of antimicrobial peptides and complement systems.  On the other hand, pathogens that manoeuvre the innate immune system have to face the adaptive immune system which eliminate or prevent the growth of pathogens. However, unlike the innate system, adaptive immunity develops immunological memory after response to a specific pathogen. Both include humoral and cell mediated immunity components.
Disorders of the immune system are autoimmune disease, hypersensitivity and immunodeficiences. Many researchers are trying to explore the effects of a variety of factors — from foods and herbal supplements to exercise and stress — on immunity. But thus far, no one really knows what these measurements mean in terms of your body’s ability to fight disease. They provide a way of detecting whether something is going on, but science isn’t yet sufficiently advanced to understand how this translates into success in warding off disease.Scientists don’t know whether an herb that seems to raise the levels of antibodies in the blood is actually doing anything beneficial for overall immunity.1
However, deficiencies of some micronutrients such as selenium, zinc, iron, copper, folic acid, vit A, B6, C and E could alter immune responses amongst other factors.

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