Imagine that a potential pathogen has been able to get through the skin, the first line of body defense. What three general defense mechanisms can the body use as a second line of defense to prevent the pathogen from causing a major infection?

If pathogens are able to get past the first line of defence, for example, through a cut in your skin, an infection develops. The second line of defence is a group of cells, tissues and organs that work together to protect the body. This is the immune system.

Explanation: