The second line of defence is the non-specific immune system, a host of quick, non-specific methods of killing microbes that have passed the first line of defence and entered the body.
Phagocytes are large, irregularly-shaped leukocytes that destroy bacteria, viruses, and dust particles.
The phagocytes show amoeboid movement (foot like structure), constantly changing shape, as they engulf microbes.
The engulf vesicles join together to form phagosomes(phagocytic vesicle).
The phagosome then fuses with lysosomes which contain containing lysozymes.
These enzymes killing and digesting the microbes.
The process is called phagosytosis.