Question

Name an allergen and write the response of the human body when exposed to it.

Answer 1

Any substance which is eaten or inhaled and causes an allergic reaction when recognized by the immune system is called an allergen. It leads to allergy symptoms when the immune system recognizes allergens as foreign or dangerous substances in some people.

Complete answer:
-A substance mostly ate or inhaled and causing allergic reactions under the response by the immune system, is known as an allergen.
-A person can be allergic to anything the most common allergens are dust, pollen grains, and pet dander.
-The immune reactions against the allergen are activated when it enters the body and starts to produce antibodies. So, these allergen antibodies start to move towards the mast cells lining the nose, eyes, and lungs and start to release chemicals or histamines that irritate and inflame the moist membrane lining the nose and start to produce symptoms of an allergic reaction.
-Symptoms include - itching, sneezing, watery eyes, scratchy throat and all these symptoms last longer than 7 to 10 days.
-Urushiol, is a resin produced by poison ivy and poison Oak. It is a type of allergy and which causes skin rash known as urushiol-induced contact dermatitis.
-A skin cell configuration is changed which is no longer identified by the immune system as a part of the body.
-What fever is caused due to the allergy by the grass. sneezing, running nose, allergic conjunctivitis, watery and itchy eyes are some of the symptoms caused due to allergy by the grass.
-Seasonal allergy can also occur depending on the season and the symptoms may be severe. Symptoms include coughing, wheezing, and irritability.
-Some people also experience depression, have sleeping problems, and also lose their appetite. Some people experience a headache also.

Note: -Abnormally vigorous immune response is produced by the immune system against the allergen to fight from the threat. So, the allergen is a type of antigen.
-An allergic reaction is normally harmless and does not cause an immune response in everyone.
-Itching, inflammation, or tissue injury are some of the allergic responses against the allergen.