These cells synthesize hemoglobin and transport of oxygen to tissues. This family of cells play an important role in the inflammatory response, and the defense of the body against viral, bacterial, fungal, and parasitic infections. Leukocytes are further subdivided into polymorphonuclear leukocytes, eosinophils, basophils, monocytes, and lymphocytes. More on this later. Megakaryocytes - Large cells found in the bone marrow which shed part of their cytoplasm as platelets .
Platelets circulate in the blood and play a vital role in the control of bleeding.
Fibroblasts - An extremely versatile connective tissue cell that specializes in the secretion of collagen and elastin. Plays an important role in wound healing. Macrophages - Scavenger cells that specialize in phagocytosis of invading microorganisms, dead cells, and foreign proteins. Macrophages are derived from a type of WBC called a monocyte. Macrophages also play an important role in the activation of the immune system in response to microorganisms and foreign proteins.