Essay on Allergies and Allergic Reactions

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Healthy humans have two types of immune systems that protect the body from invading pathogens that cause diseases. The Innate Immunity is the first barrier of protection. It is similar to a force field. Its primary purpose is to destroy any pathogen that tries to enter the epidermis cells (the skin cells) and the mucosa (mucus secreting cells found in the GI tract, respiratory tract, urogenital tract and eyes. If the first defense does not work, the adaptive immunity steps in to eradicate the invading microbe. Yet, sometimes the body reacts to harmless agents as if they were pathogens. Every day, more adults develop allergies to things in their environment. Exposure to such things as pollen, grass, mold and pet dander1 can lead to mild or…show more content…
When an allergen enters the body, Ig E binds tightly to its receptor, FcεRI, which expresses basophil and mast cells. When Ig E is crosslinked with an antigen, mast cells release histamine. The body reacts to this by sneezing, coughing, vomiting and producing diarrhea, all of which are signs of allergic reactions. If allergens enter the bloodstream, mast cells associated with blood vessels will be activated. This type of hypersensitivity will cause systemic anaphylaxis. Vascular permeability and smooth muscle constriction will increase. Blood pressure will also be affected. It will drop dramatically. When this occurs, organs will become at risk for failing. The human body expresses its reaction of allergies in many different ways. Symptoms can manifest itself through illness involving the skin, mucosal tissue or both.3 Epidermis can display mild reddish spread on the skin to a severe rash. Sensitivity involving the mucosa can lead to respiratory problems or digestion issues, examples of such are persistent phlegm, cough, and pain and flare ups3. When a person is prone to allergies, contact with an allergen causes a reaction within minutes or hours.3 A case can be made that exposure to certain allergens can increased the development of allergic reactions in adults. Researchers in Italy looked at a group of adult patients. The
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