which type of blood cell becomes a macrophage
Macrophage Macrophages (Greek: big eaters, from Greek μακρός (makrós) = large, φαγείν (phageín) = to eat[1]) are a type of white blood cell, of the immune system, that engulfs and digests cellular debris, foreign substances, microbes, cancer cells, and anything else that does not have the type of proteins specific to healthy body cells on its surface[2] in a process called phagocytosis. These large phagocytes are found in essentially all tissues,[3] where they patrol for potential pathogens by amoeboid movement. They take various forms (with various names) throughout the body (e.g., histiocytes, Kupffer cells, alveolar macrophages, microglia, and others), but all are part of the mononuclear phagocyte system. Besides phagocytosis, they play a critical role in nonspecific defense (innate immunity) and also help initiate specific defense mechanisms (adaptive immunity) by recruiting other immune cells such as lymphocytes. For example, they are important as antigen presenters to T cells. In humans, dysfunctional macrophages cause severe diseases such as chronic granulomatous disease that result in frequent infections.
Dermis The dermis is composed of three major types of cells:[3] fibroblasts, macrophages, and adipocytes.
Cell theory The first of these tenets is disputed, as non-cellular entities such as viruses are sometimes considered life-forms.[1]
Antigen Antigen presenting cells present antigens in the form of peptides on histocompatibility molecules. The T cell/T lymphocyte (a subtype of white blood cell), of the adaptive immune system, selectively recognize the antigens. Depending on the antigen and the type of the histocompatibility molecule, different types of T cells will be activated. For T-Cell Receptor (TCR) recognition, the peptide must be processed into small fragments inside the cell and presented by a major histocompatibility complex (MHC).[5] The antigen cannot elicit the immune response without the help of an immunologic adjuvant.[3] Similarly, the adjuvant component of vaccines plays an essential role in the activation of the innate immune system.[6][7]