Phagocytosis (image) DOE/Lawrence Berkeley National Laboratory Share Print E-Mail Caption Phagocytosis is the process by which a macrophage type white blood cell engulfs a bacterium in a membrane-bound shell called a phagosome. The phagosome fuses with a lysosome which carries digestive enzymes that destroy the bacterium. Credit Flavio Robles, Berkeley Lab Public Affairs-CSO Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.