Exam 24: A: Immune System

Phagocytosis is a nonspecific defense mechanism.

Interferon can act like a paracrine hormone that allows infected cells to send an alarm to other nearby cells.

The toll-like receptors on the cell membrane can be seen as a mid-point between specific and nonspecific immunity.

Pyrogens are produced only by body cells that have been infected by a virus.

Toll-like receptors help facilitate the overall innate immune response.

Passive immunity provides more rapid protection than does active immunity.

The epithelial barriers in the body are part of the innate,nonspecific defenses of the body and do not play a role in the specific immune system.

A person without a functioning immune system would not benefit from an injection of antibodies developed by someone else.

T cells secrete antibodies.

An autoimmune disease would indicate a problem with development of self-tolerance in the immune system.

The cloning of T cells produces both memory cells and plasma cells.

All of the cells in a clone of plasma cells produce identical antibodies.

An antibody has one antigen-binding site.

Antigens are macromolecules that induce the immune system to take certain actions.

Interferon mainly interferes with the ability of bacteria to produce disease.

Natural killer cells are 15% of the total lymphocyte cell number.

Fever is always detrimental to the body and should be lowered as soon as possible.

Most of the pus surrounding an inflammation site consists of dead or damaged tissue cells.

Antigens activate B cells.

IgD is the most understood antibody.