Ck 12: Life Science: Barriers to Pathogens

[Free Registration/Login may be required to access all resource tools.] Your body has many ways to protect you from pathogens. Your body's defenses are like a castle. The outside of a castle was protected by a moat and high walls. Inside the castle, soldiers were ready to fight off any enemies that made it across the moat and over the walls. Like a castle, your body has a series of defenses. Only pathogens that get through all the defenses can harm you. Learn more about barriers to pathogens in this learning module produced by CK-12.