Info

CELLS OF THE IMMUNE SYSTEM, 16

Phagocytes, 16

Mast Cells, Basophils, Eosinophils, 18 Antigen-Presenting Cells, 19 Lymphocytes, 20

ANATOMY AND FUNCTIONS OF LYMPHOID TISSUES, 26

Bone Marrow, 26 Thymus, 28

The Lymphatic System, 29 Lymph Nodes, 30 Spleen, 33

Regional Immune Systems, 34 SUMMARY, 34

The cells of the innate and adaptive immune system are normally present as circulating cells in the blood and lymph, as anatomically defined collections in lymphoid organs, and as scattered cells in virtually all tissues. The anatomic organization of these cells and their ability to circulate and exchange among blood, lymph, and tissues are of critical importance for the generation of immune responses. The immune system faces numerous challenges to generate effective protective responses against infectious pathogens. First, the system must be able to respond rapidly to small numbers of many different microbes that may be introduced at any site in the body. Second, in the adaptive immune response, very few naive lymphocytes specifically recognize and respond to any one antigen. Third, the effector mechanisms of the adaptive immune system (antibodies and effector T cells) may have to locate and destroy microbes at sites that are distant from the site where the immune response was induced. The ability of the immune system to meet these challenges and to perform its protective functions optimally is dependent on several properties of its cells and tissues. The major cells and tissues of the immune system and their important roles are the following:

Was this article helpful?

0 0
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