Observe the figure and
(a) Identify the process and write its name.
(b) Write the step of the process in each stage.

a) The process is phagocytosis.

The antigen such as bacteria is engulfed by the white blood cells which are phagocytic such as macrophages and monocytes. A phagosome is formed inside the cell. This phagosome fuses with the lysosome to form phago-lysosome. The bacteria is lysed by the hydrolytic enzymes of the lysosome. Hence the phagocytic cells in the human body play an important role in immunity.