The immune system is a collection of cells and proteins that works to protect the body from potentially harmful, infectious microorganisms (microscopic life-forms), such as bacteria, viruses and fungi The immune system plays a role in the control of cancer and other diseases, but also is the culprit in the phenomena of allergies, hypersensitivity and the rejection of transplanted organs, tissues and medical implants
The body's natural defence system It includes organs (such as the spleen and appendix), lymph nodes (including the 'glands' in the neck) and specialist white blood cells called lymphocytes The immune system protects the body from infections, foreign bodies and cancer To prevent rejection of a transplant kidney, it is necessary for patients to take immuno-suppressant drugs
system which forms antibodies and works against foreign bodies that attack the body
The body's very complex system (made of many organs and cells), which defends the body against infection, disease, and foreign substances
A complex system in our bodies that is responsible for protecting us against infections and foreign substances
A complex system in the body which fights disease by recognizing bacteria and viruses as foreign and developing a defense against them (the immune response) Vaccines protect against disease by stimulating the immune system to produce this immune response
Your immune system consists of all the organs and processes in your body which protect you from illness and infection. The integrated body system of organs, tissues, cells, and cell products such as antibodies that differentiates self from nonself and neutralizes potentially pathogenic organisms or substances. the system by which your body protects itself against disease. Cells, cell products, organs, and structures of the body involved in the detection and destruction of foreign invaders, such as bacteria, viruses, and cancer cells. Immunity is based on the system's ability to launch a defense against such invaders. For the system to function properly, it must be able to distinguish between the material of its own body (self) and material that originates outside of it (nonself). Failure to make this distinction can result in autoimmune diseases. An exaggerated or inappropriate response by the immune system to nonharmful substances (e.g., pollen, animal dander) can result in allergies. The system's principal cells include lymphocytes that recognize antigens and related accessory cells (such as phagocytic macrophages, which engulf and destroy foreign material). Lymphocytes arise in the bone marrow from stem cells, with T lymphocytes (T cells) migrating to the thymus to mature and B lymphocytes (B cells) maturing in the bone marrow. Mature lymphocytes enter the bloodstream, and many become lodged, along with accessory cells, in various body tissues, including the spleen, lymph nodes, tonsils, and intestinal lining. Organs or tissues containing such concentrations are termed lymphoid. Within these organs and tissues the lymphocytes are confined within a delicate network of connective tissue that channels them so they come into contact with antigens. T cells and B cells can mature and multiply further in lymphoid tissue when suitably stimulated. Fluid (lymph) draining from lymphoid tissues is conveyed to the blood through lymphatic vessels. Lymph nodes distributed along these vessels filter the lymph, exposing macrophages and lymphocytes contained within to any antigen present. The spleen plays a similar role, sampling the blood for the presence of antigens. The capability of lymphocytes to pass between lymphoid tissue, the blood, and lymph is an important element in the system's functioning. See also immunodeficiency; immunology
A complex organization of organs, tissues, cells, and natural chemicals that normally protects the body from infections, diseases, and foreign substances by attacking the invaders or the abnormal cells
a complex network of specialized cells, tissues, and organs that defends the body against attacks by disease-causing microbes
a collection of cells and proteins that works to protect the body from potentially harmful, infectious microorganisms, such as bacteria, viruses, and fungi
the body's defense system that protects against foreign invaders (e g , microorganisms) and cancerous cells Some immune defenses are nonspecific (e g , phagocytosis) Defenses against specific antigens are of 2 types: cell-mediated (TH1) and humoral (antibody-based, or TH2) Organs of the immune system include the lymph nodes, spleen, thymus, tonsils and bone marrow
n The body system, made up of many organs and cells, that defends the body against infection, disease and foreign substances The term describes the interacting combination of all the body's ways of recognizing cells, tissues, objects and organisms that are not part of itself, and initiating the immune response to fight them Click here for more information about the immune system
a system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response
the body's defense system that protects against foreign invaders (e g , microorganisms) and cancerous cells There are 2 branches: cell-mediated (Th1) and humoral (antibody-based or Th2) Organs of the immune system include the lymph nodes, spleen, thymus, tonsils and bone marrow
(im-YOON): The complex group of organs and cells that defends the body against infection or disease
The cells, tissues and organs that assist the body to resist infection and disease by producing antibodies and/or altered cells that inhibit the multiplication of the infectious agent
complex network of specialized cells and organs that work together to defend the body against attacks by "foreign" invaders such as bacteria and viruses In some rheumatic conditions, it appears that the immune system does not function properly and may even work against the body