Essay --

In normal cases the repellent systems white blood cells protect the physical structure from harmful substances, called pathogens. A pathogen is anything that tries to harm the body. Some examples of pathogens are fungi, bacteria, protozoans, and viruses, and blood or tissues from another species or person. The resistant system produces antibodies that destroy these harmful substances. An antibody is give care a protein marker produced by B-Cells to identify foreign objects. Unfortunately, as profitable the immune system is for our bodies, there are some(prenominal) disorders and diseases related to it. repellent system disorders cause low immune activity or everywhere immune activity in the immune system. During immune system over activity cases, the body damages and attacks its own tissues these diseases are known as autoimmune diseases. Immune deficiency decreases the bodys ability to fight pathogens, causing a higher chance for infection.Allergies are an example of the im mune systems over-activity diseases. Allergies occur when the immune system reacts to foods or substances that are not harmful. The most common allergens are pets and pollen. When the immune system senses an allergen, it releases unneeded chemicals. Histamine for example, is one of the chemicals that are released after the immune system senses an allergen it triggers an inflammatory response. Allergic reactions like this have many symptoms that skunk include breathing problems, eye irritation, rash, even nausea and vomiting. Asthma is a condition where the immune system becomes over-active in the bronchi. Many people with asthma attack suffer constriction in their bronchial tubes, which make it harder to breath. An asthma give persons airways are almost always under inflammation. There is no im social function cure f... ...rittle bones, and death 20% of people who have a thyroid gland storm die.The final immune disorder I want to reference is immunodeficiency. Immunodeficiency is the failure of the immune system to protect the body from harmful substances and infection. more(prenominal) or less of the time it is caused by the absence of some components needed. The main cause of immunodeficiency rough the world is the Human immunodeficiency Virus (HIV). HIV attacks and kills a crucial part of the immune system T helper cells. T Helper-Cells kills septic cells. And without T-Cells many other immune cells cannot work properly, including B-Cells that make antibodies. A person infected with HIV may not show any signs or symptoms for years. scarce as HIV kills more and more T-Cells die the body becomes more vulnerable to infection. And when infected cells outnumber uninfected cells, then the patient allow for have AIDS.