PATHOLOGY

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 effector cells of the innate immune system that phagocytose bacteria and secrete both pro-inflammatory and antimicrobial mediators. In addition, macrophages play an important role in eliminating diseased and damaged cells through their programmed cell death.

Detailed explanation-3: -Monocytes, macrophages, and neutrophils are phagocytes. A phagocyte is a type of white blood cell.

Detailed explanation-4: -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.