What are the 3 lines of defense ?
1. Primary (skin, mucus, bile, eyes, mouth, vomiting, diarrhea) - nonspecific
2. Secondary (Activation of WBCs, phagocytes, release of toxins , histamines and heparin/ complete cascade and inflammation...) - nonspecific
3. Tertiary (activation of immune response, B and T Lymphocytes: attach to antigen, phagocytosis, neutralization, agglutination, activation of complement and inflammation) - specific