Stamped concrete refers to the process of decorating concrete once it has been laid by an installer. Professional landscaping and patio companies use the same type of concrete used in driveways and other projects, and the material consists of a sandy substance that the installer mixes with water.
The major organs of the immune system are bone marrow, thymus, spleen and lymph nodes. These organs produce lymphocytes required to destroy bacteria, virus, tumor cells, etc. This article dwells on these major immune system organs that protect the human body from infections.
The organs of the immune system are positioned throughout the body. They are called lymphoid organs because they are home to lymphocytes, small white bloodcells that are the key players in the immune system.here are two groups of immune system organs. 1  Primary (central)--organs where immature lymphocytes develop. 2  Thymus. 3  Bone marrow. 4  Secondary (peripheral)--tissues where antigen is localized so that it can be effectively exposed to mature lymphocytes. 5  Lymph nodes. 6  Appendix. 7  Peyer's Patches (of GI tract). 8  Tonsils. 9  Adenoids.