Ch 24 Immune System

Active Immunity

a form of acquired immunity in which the body produces its own antibodies against disease-causing antigens

Complement system

a group of about 30 different proteins that circulate in an inactive form in the blood. They can: invade, attach, or act as chemical signals, trigger inflammatory response

Innate Immunity

a set of defenses that are active immediately upon infection and are the same whether or not the pathogen has been encountered or not

Inflammatory response

an innate body Thdefense, includes redness, heat and swelling

Macrophages

are large phagocyte cells that wander through the interstitial fluid, eating any bacteria or virus they encounter.

Interferons

are proteins produced by virus infected cells that help to limit the cell to cell spread of a virus. They send out a signal.

Natural Killer cells

attack cancer cells and virus infected cells by releasing chemicals that lead to cell death.

The lymphatic vessels carry

fluid called lymph

Lymph nodes

little round organs packed with macrophages and lymphocytes

The role of cytotoxic T cells is the secretion of _____, which plays a role in the _____ immune response.

perforin ... cell-mediated

Autoimmune disease

results when the immune system turns against some of its bodies own molecules; examples are Lupus and MS

Passive Immunity

- receives antibodies from another source; Premade

Immune System

the body's system of defenses against agents that cause disease

Pathogens

Agents that cause disease

Secrete Antibodies

B cells

Clonal selection is the division of _____ that have been stimulated by binding to an antigen, which results in the production of cloned _____.

B cells......Plasma cells and Memory cells

Phagocytosis

Cellular ingestion and digestion of foreign substances

Adaptive Response

Defense against Pathogens inside body cells and body fluid

_____ interact with the antigen-class II MHC complex presented by macrophages.

Helper T cells

cells is a phagocytic leukocyte that can engulf a foreign bacterium?

Marophges

Which of these cells is responsible for the rapidity of the secondary immune response?

Memory Cells

Innate Internal Barriers

Natural Killer Cells, Phagocyte Cells, Defensive Proteins, Inflammatory response

Two main Phagocyte cells are

Neutrophils and macrophages

The lymphatic system's job

to return tissue fluid back to the circulatory system and to fight infection

B cells that have been stimulated by interleukin-2 develop into _____.

Plasma Cells

Innate External Barriers

Skin, Hairs, Cilia, Secretions, Mucous Membranes

Neutrophils

The most abundant white blood cell, circulate in the blood and enter tissues at sites of infection