Exam 24: A: Immune System

A person with a nonfunctioning immune system could still benefit from both natural and artificial passive immunity.

The role of fibroblasts in the inflammation response is to lay down a collagen web to try to isolate the infecting organism.

Apoptosis is a programmed cell death used by natural killer cells.

The body identifies normal body cells by way of the unique major histocompatibility complex displayed by the cell as a surface protein.

Unlike B cells,T cells do not display antigen receptors on their surface membranes.

An activated B cell can give rise to both plasma cells and memory cells.

Many of the inflammation mediators act as chemotactic factors.

A person's natural killer cells usually kill cells of their own body.

Memory cells do not actually produce antibodies.

The heavy chains in an immunoglobulin molecule are about twice as long and weigh about twice as much as light chains.

Most antigens are large protein molecules foreign to the body.

Once released from the bone marrow,the B cells migrate to the bursa of Fabricius to complete their development.

Adaptive immunity requires two signals: antigen and chemical.

Complement is a group of about 8 different inactive enzymes circulating in the plasma.

T lymphocytes release histamine,kinins,and prostaglandins at the site of an infection.

One reason for species resistance is the difference in molecules on the cell membrane of different species.

If a person had a severe shortage of antigen-presenting cells,it would have the greatest impact on the humoral or antibody-forming specific immune system.

Digestive enzymes and hydrogen peroxide are added to a phagosome to digest the phagocytized microorganism.

Interferon production is stimulated by the presence of double-stranded DNA in a cell.

An antibody consists of two heavy and one light polypeptide chains.