The Human Body 's Defense System

Autoimmune disease- any of a large group of diseases characterized by abnormal functioning of the immune system that causes your immune system to produce antibodies against your own tissues (the definition from wordnetweb.pronceton.edu).

As I was doing my research I came across the autoimmune part and totally lost. It’s a breakdown in the immune system. As we know every person produces their own cell types that fight off disease and infection. In order to fight off the bad bacteria our bodies must be able to recognize the bad known as antigens (often proteins) on the surface of the UN wanted invaders. Everyone’s immune system should be able to recognize the bad, and be able to fight it off. In an autoimmunity this is where the immune system is not able to recognize the invaders and fight them off.

The immune system plays a vital role in helping the body to fight diseases, as well as pathogens, the disease-causing factors. It is mainly composed of the tonsils and adenoids, the lymph nodes and lymphatic vessels, the spleen, appendix, and bone marrow. The main purpose of the immune system is to assist the body in its struggle to maintain optimal health.

The main function of the immune system is to protect the body from infectious agents such as viruses and other toxins. The immune system can fail us in two ways-either by becoming under-vigilant, letting infections enter the body, or over-vigilant, so that it is the immune system itself, rather than an infectious agent that causes illness.

The immune system is made up of trillions of specialised cells (white blood cells) that detect and destroy pathogens or their toxins. Some white blood cells, which are

The circulatory and immune systems are two very closely related systems. The circulatory is composed out of blood vessels, the heart, and blood. The immune system is made up of white blood cells and various lymph nodes. Basically, most of the immune system is found inside the blood of the circulatory system. The circulatory system provides the body with blood. It gives the kidneys of the digestive system something to filter and picks up nutrients from the small intestines. It also picks up air from the lungs of the respiratory system and provides the brain of the nervous system with blood, along with the rests of the body. Protection from wounds in the integumentary system is also provided by the circulatory system which has platelets that aid in blood clotting and forming scabs. The immune system protects all the other systems from disease and helps them from being attacked by viruses and bacteria. It also aids the ears of the nervous system with some very protective earwax. The circulatory system provides us with life fluid while the immune system protects that fluid and the rest of our body.

A. An autoimmune disease is a disorder in which the body’s immune system attacks the body’s own cells and organs.

The organs that make up the lymphatic and immune system are the tonsils, spleen, thymus gland, lymph nodes, and lymphatic vessels. White blood cells (leukocytes), red blood cells (erythrocytes), plasma, and platelets (thrombocytes) make up the blood. Lymphocytes are leukocytes (white blood cells) that help the body fight off diseases. Two types of lymphocytes are B cells and T cells. Lymphocytes recognize antigens, or foreign substances/matter, in the body. Lymphocytes are a classification of agranulocytes, or cells (-cytes) without (a-) granules (granul/o) in the cytoplasm. B cells are created from stem cells, which are located in the bone marrow. B cells respond to antigens by becoming plasma cells. These plasma cells then create antibodies. Memory B cells produce a stronger response with the next exposure to the antigen. B cells fight off infection and bacteria while T cells defend against viruses and cancer cells. A hormone created by the thymus gland called thymosin changes lymphocytes into T cells. The thymus gland is active when you are a child and slowly shrinks, as you get older. T cells bind to the antigens on the cells and directly attack them. T cells secrete lymphokines that increase T cell production and directly kill cells with antigens. There are three types of T cells: cytotoxic T cells, helper T cells, and memory T cells.

To understand autoimmune diseases, the general characteristic of autoimmunity must be addressed. Autoimmunity is defined, in short, as “ misdirected immune response”. A healthy person is equipped with the mechanisms necessary to defend the body from pathogens within the immune system. When autoimmunity is present in an individual, something within the immune system is

The lymphatic system are a complex network of specialised cells and organs that defend the body against infection. Lymphatic organs include the bone marrow, spleen, thymus gland, lymph nodes, tonsils, adenoids, appendix and clumps of tissue in the small bowel. A function of the lymphatic system is to nurture and mature the B and T-lymphocytes (white blood cells vital to immune function). Cancerous changes can take place

The lymphatic system plays an important part in the body’s defense against infection (Rockson, 2016).

The main organs that are involved in the immune system are the thymus, bone marrow, spleen, tonsils, and lymph nodes. The immune system works by having the white blood cells stored or produced in these organs. Since the white blood cells are all over the body, the immune system can constantly monitor the body for germs. There are also 2 types of white blood cells, the first is phagocytes which destroy

With autoimmune diseases, the underlying issue is similar. The body's immune system becomes unable to recognize healthy cells from diseased cells. Consequently, the immune’s own defense mechanism produces antibodies that attack the normal tissues and cells. Autoimmune diseases

spleen is a place for immune function, and it kills defective or aged red blood

Lymphocytes are a type of white blood cell, which are an important part of the immune system. Lymphocytes can defend the body against infection because they can distinguish the body’s own cells from foreign ones. Once they recognize foreign material in the body, they produce chemicals to destroy that material. Two types of lymphocyte are produced in the bone marrow before birth.