Anatomical Barriers of Immune System- Skin and Mucus

Anatomical Barriers of Immune System- Skin and Mucus

Before a microbe or parasite can invade the host and cause infection, it must first attach to and penetrate the surface epithelial layers of the body. Organisms gain entrance into the body by active or passive means. For example, actively, they might burrow through the skin, while passively be ingested in food, inhaled into the respiratory tract or penetrate through an open wound. Whatever the point of entry, they have to pass across the external physical barriers that insulate the … Read more