Exam 24: A: Immune System

To function independently in the immune process,both B cells and T cells must become thymocytes during development.

Natural killer cells are a group of neutrophils that kill many types of tumor cells and cells infected by different kinds of viruses.

In an antibody,the light chain makes up the variable region and the heavy chain makes up the constant region.

One function of phagocytes is to function as antigen-presenting cells.

Another name for antigenic determinants is epitopes.

IgM is the most predominant class of immunoglobulins in the body.

A mother passing antibodies to the fetus is an example of natural passive immunity.

A fever is a reset of the body's thermostat.

Passive immunity generally lasts longer than active immunity.

Cytokines are chemicals released from cells to trigger or regulate both innate and adaptive immune responses.

An antibody molecule must have at least two antigen-binding sites.

B cells play an important role in humoral immunity.

Natural killer cells are lymphocytes that are actually part of nonspecific immunity.

In humans,bursa equivalent tissue is the site for B-cell development.

Antibody molecules can have as many as eight antigen-binding sites.

Haptens are sometimes called incomplete antigens.

Plasma cells must be in a constant state of protein synthesis to accomplish their function.

The ability of our immune system to attack abnormal or foreign cells but spare our own normal cells is called innate immunity.

Mechanical and chemical barriers can be called the body's first line of defense.

Diapedesis is the process by which neutrophils migrate out of the bloodstream and around the tissue cells to the injury site.