LIFESCI 2 Chapter Notes - Chapter 45: Mucous Membrane, Lymphatic Vessel, Monocyte
Document Summary
The immune system: protects against infection and microbes, isolates and removes nonmicrobial foreign substances. Pathogens: parasite, bacteria, protist, fungi, virus. Organization of the immune system: nonspecific immune response. Protects against foreign sustances without having to recognize their identity. Skin: surface cells are dead cells that have overproduced keratin proteins as the move from deep layers towards surface layer. Mucous membrane of the urinary and reproductive system. Sebum: oily acidic substance released from sebaceous glands. Lysozymes: enzymes secreted from the mucous membranes. Defensins: peptides secreted from the mucous membranes. Lymphoid tissues: adenoids, tonsils, thymus, lymph nodes, spleen, bone marrow. Myleoid cells: basophil, eosionphil, neutrophil, mast cells, Neutrophils: most abundant phagocytic cells, release cytokines, vasodilators, and chemotaxins. Monocytes/macrophages: engulf and digest, activate t cells. 2: once monocytes enter tissue they become macrophages. Mast cells: mast cells are found throughout connective tissues (not found in blood, they release histamine and other chemicals involved in inflammation.
