Immunodeficiency disorders are a group of disorders in which part of the immune system is missing or defective.
Adaptive immunity is divided into two components: humoral immunity and cellular immunity.
The innate immune system is made up of the skin (which acts as a barrier to prevent organisms from entering the body), white blood cells called phagocytes, a system of proteins called the complement system, and chemicals called interferons.
When phagocytes encounter an invading organism, they surround and engulf it to destroy it. The elements in the complement system create a hole in the outer layer of the target cell, which leads to the death of the cell.
The adaptive component of the immune system is extremely complex, and is still not entirely understood.
Basically, it has the ability to recognize an organism or tumor cell as not being a normal part of the body, and to develop a response to attempt to eliminate it.
The humoral response of adaptive immunity involves a type of cell called B lymphocytes.B lymphocytes manufacture proteins called antibodies (which are also called immunoglobulins).Any defect in the immune system decreases a person's ability to fight infections.A person with an immunodeficiency disorder may get more frequent infections, heal more slowly, and have a higher incidence of some cancers.The normal immune system involves a complex interaction of certain types of cells that can recognize and attack "foreign" invaders, such as bacteria, viruses, and fungi. The immune system has both innate and adaptive components.Innate immunity is made up of immune protections people are born with. It adapts to fight off specific invading organisms.