IMMUNOLOGY

Detailed explanation-1: -The process where these white blood cells surround, engulf, and destroy foreign substances is called phagocytosis, and the cells are collectively referred to as phagocytes. Phagocytes eventually die. Pus is formed from a collection of dead tissue, dead bacteria, and live and dead phagocytes.

Detailed explanation-2: -Macrophages are large, specialized cells that recognize, engulf and destroy target cells. The term macrophage is formed by the combination of the Greek terms “makro” meaning big and “phagein” meaning eat.

Detailed explanation-3: -The phagocyte engulfs the pathogen. The membrane of the phagocyte engulfs the pathogen into the phagocyte cell, and encloses it into a vesicle called a phagosome. Lysosomes break down the pathogen. The phagosome vesicle then secretes digestive enzymes, called lysosomes, to break down the pathogen.