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

Non-Specific Immune Response

Non-Specific Immune Response

Defence mechanism refers to the ways in which the body protects itself from invasion of pathogenic organisms or other foreign materials such that it provides defence against their harmful effects. The defence mechanism employed may be achieved through either specific or non-specific mechanisms. Non-specific defence mechanisms are termed so as it offers resistance or protection against all organisms or foreign materials encountered without any specificity. This is to say that they are not directed against a particular pathogen or substance. … Read more