Lecture 4 : Immunity, Circulatory System and Respiratory System. What are the first, 2nd and third lines of defense? First : External Barriers-Skin(coated with chemicals) and Mucous Membranes. (Line digestive, respiratory, urinary and reproduction tracts) Second – Phagocytosis, complement,inflammation response – Can limit further infection and attack microbial invaders. . Third- Lymphocytes, antibodies. Innate Immune Response – An immune response that does not target specific microbial invaders…
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