Microbiology Chapter 32

Composed of widely distributed cells, tissues, and organs that recognize foreign substances, including mircroorganisms, and act to neutralize or destroy them

First line of defense against any microorganism or foreign material encountered by the vertebrate host

Resists a particular foreign agent

Substances that are recognized as foreign and provoke immune responses

Bind to specific antigens and inactivate them or contribute to their elimination

Cells that function in both innate and adaptive immunity

Blood cell development in the bone marrow

Thick, closely packed cells that make up the outer layer of skin and produce keratin

Released by activated phagocytic cells called macrophages and polymorphonuclear leukocytes. It sequesters iron from the plasma, reducing the amount of iron available to microbes

An enzyme that catalyzes the production of superoxide radicals, a reactive oxygen intermediate that is toxic to many microorganisms

Coats the mucosal surfaces of lower portions of the respiratory tract and traps microbes

Population of fixed phagocytic cells in the aveoli that can ingest and kill most bacteria

Cells in the mucous membranes of the intestinal tract that produce lysozyme and cryptins

A type of defensin that is toxic to some bacteria

A peptide that arises froma precursor protein having a C terminus bearing the mature peptide of some 12 to 80 amino acids