2. Explain How The Skin Function As An Allergic Response.

Stress And The Immune System The immune system is a very important part of our bodily functions as its main function is to protect the body against millions of antigens, which attack our cells and try to reproduce viruses and diseases. The immune system can protect the body in three different ways, in which are: 1. It creates a barrier that prevents the antigens from initially entering the body. 2.

The body’s protection against viruses, bacteria and other types of invasions is our immune system (Tortora, 2014).

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.

Adaptive immunity (p.446): The body’s ability to recognize and defend itself against distinct invaders and their products.

As described by the Centers for Disease Control, chronic disease is the leading cause of death and disability in the United States. A The body is so well designed in some areas yet so poorly designed in others. Why has selection left us so vulnerable to disease? (Nesse, 2005.) Cancer, Diabetes, Cardio vascular,and Respiratory disease. (Infectious and Chronic Disease, 2015.) The immune system is the first line of defense against diseases and infections it a system of organs, tissue cells, and cell products such as antibodies. These antibodies neutralize potentially pathogenic organisms or substances. Signs of our immune system at work are coughing, fever, pain, nausea, vomiting, anxiety and fatigue; these are not abnormalities yet people seek medical help. The presence of these symptoms are fighting mechanisms of our immune system, thus being beneficial since they are aversive and are not themselves problems but a solution. The evolution significance of a disease like sickle cell, creates an immunity to malaria. “Sickle Cell Anemia, as long as carried heterozygous (AS), serve as an effective preventable took against the largest infectious disease killer in the world.” (Understanding our

and other substances that are reabsorbed back into the body. It is also responsible for

The immune system is an important and complex part of the human body, guarding it against bacteria

The immune systems helps the body fight off the other parts of our bodies and harmful substances such as disease, infection or bacteria. Some strategies for ensuring a healthy immune system are: don’t smoke, move your body which mean exercise regularly, eat diet food such as fruit and vegetable, get a good night sleep and maintain your healthy weight. These strategies are a good way to start giving your immune system the upper hand.

In the biology Immunology field, immunity is defined as the balanced state of a living organism for instance, the human body having sufficient biological defenses to combat infection, illness, or other unwanted biological incursion, while having acceptable tolerance to avoid contamination and allergies (Sompayrac, 2012, p.5). The immune system is a group of cells, nerves, and molecules that defend the body from many pathogenic microorganisms and contaminants in the environment.

Pathogens can quickly change and adjust to escape detection and destruction by the immune system. Therefore, several defense mechanisms have too changed to identify and neutralize pathogens. Disorders of the immune system can cause autoimmune disease, inflammatory diseases, and cancer. Immunodeficiency appears when the immune system is less functioning than normal, causing in recurrent and life threatening infections. Immunodeficiency may be an effect of inherited disease passed down. Autoimmunity happens from a hyperactive immune system attacking normal tissue believing they are foreign organisms. Some familiar autoimmune diseases are hashimoto’s thyroiditis, diabetes mellitus type 1, systemic lupus erythematosus, and rheumatoid arthritis.

For example, Wiskott-Aldrich and Beckwith-Wiedemann syndrome are known to alter the immune system. The immune system is a complex system that functions to protect our bodies from infection and disease. The bone marrow produces cells that later mature and function as part of the immune system. One theory suggests that the cells in the bone marrow, the stem cells, become damaged or defective, so when they reproduce to make more cells, they make abnormal cells or cancer cells. The cause of the defect in the stem cells could be related to an inherited genetic defect or exposure to a virus or toxin. Exposures to certain viruses Epstein-Barr virus and HIV, the virus that causes AIDS, have been linked to an increased risk of developing certain childhood

with something called apoptosis or a programmed cell death, that kills the infected cells. But this is the first defense, which is called the Innate defense system (keep out, or quietly neutralizes, pathogens). The second defense is called the Adaptive immune system. When a white blood cell meets a new disease, it tries to meet with it and remember it from a threat to a friend. This ability to remember specific pathogens is one of the key differences between the adaptive and innate defenses. The Adaptive immune system can fight the new or known diseases throughout the whole body by two defenses, the Humoral immunity, and Cellular defenses. The humoral immunity despatches something called antibodies. Antibodies are made by special white blood cells and control the body's humor or fluids, like blood.

The immune system consists of a defense system that guards the body against invasion from infections and other diseases. Normally, a healthy person's immune system has the capability to differentiate between its own cells and cells that represent threats to the health of the body. (Craft and Kanter, 2002). Autoimmune disease refers to a broad range of over 80 acute, long-lasting diseases that affect nearly every organ in the body. (Wrong Diagnosis.com, 2000).

The body has two immune systems: the innate immune system and the adaptive immune system.

When the pathogen replicates different components of immune system evolves to protect against various types of pathogens. However infection of an organism does not necessarily shows diseases, disease are only present when the bolus of infection, in terms of when immunity is comprised. All components of