stimulates and increases the ability of leucocytes (white blood cells) and phagocytes
to clean up foreign bodies in the bloodstream, including bacteria, fungi, dead cells and waste byproducts.
There are 3 types
The granulocytes: A type of white blood cell filled with microscopic
granules (little sacs containing enzymes) that digest microorganisms, and are part of the innate immune system and have somewhat
nonspecific, broad-based activity. They do not respond exclusively to specific antigens, as do B-cells and T-cells;
The lymphocytes: nearly colorless cells found in the blood, lymph, and lymphoid tissues, constituting approximately
25 percent of white blood cells and including B cells, which function in humoral immunity (elements in the blood or other
body fluids), and T cells, which function in cellular immunity;
The monocytes: a type of granular leukocyte that functions in the ingestion of bacteria.
Phagocytes are sometimes called scavenger cells because they
engulf and digest debris and invading microorganisms.