Formed elements

- Destroy cancer cells, cells infected with viruses, and foreign cells - Present antigens to activate other cells

- Granules release histamine (vasodilator); causes inflammation (allergic response) - Granules release heparin (anticoagulant)

Basophil

Enter tissues, differentiate into free macrophages - Phagocytize pathogens, dead neutrophils, and debris - Present antigens to activate other immune cells

Eosinophil

Erythrocytes (red blood cells)

Monocyte

Neutrophil

Phagocytise pathogens and debris in tissues - Granules release antimicrobial chemicals

Phagocytize antigen-antibody complexes, allergens, and inflammatory chemicals - Granules release chemicals to reduce inflammation - Release enzymes that weaken or destroy parasites

Platelets

Red Blood Cells (RBCs) •Transport O2 and CO2

Small lymphocyte

Stick together forming platelet plugs