Chapter 3- Immunity, Infection & Inflammation

innate immunity

All multicellular organisms, including invertebrates and plants, express the ancient protective mechanism of

pattern recognition receptors (PRRs)

TLRs are referred to as _ because they recognize and respond to the molecular patterns expressed by pathogens.

Humoral immunity

is mediated by circulating immunoglobulin antibodies in the γ-globulin fraction of the plasma proteins.

Cellular immunity

is mediated by T lymphocytes. It is responsible for delayed allergic reactions and rejection of transplants of foreign tissue.

Lymphocytes

key elements in the production of acquired immunity.