The function common to neutrophilis, monocyte & macrophages is-
Immune response
Phagocytosis
Liberation of histamine
Destruction of old crythrocytes
The professional phagocytes include many types of white blood cells (such as neutrophils, monocytes, macrophages, mast cells, and dendritic cells). Reff: Ananthanarayanan & Panikers textbook of microbiology 9th edition pg: 138
Immunology