what is immunity write short note
Answers
IMMUNITY :
immunity is the ability of a person to resist any disease or toxin by the action of some antibodies or senisitized WBCS .....
immune system of each person differs ....
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1st Answer:
Immunity is the ability of the body to defend itself against disease-causing organisms. Everyday our body comes in contact with several pathogens, but only a few results into diseases. The reason is, our body has the ability to release antibodies against these pathogens and protects the body against diseases.
2nd Answer:
The Immune System consists of different types of cells and molecules, which protect our body against pathogens. Pathogens are defined as everything from parasites to fungi, bacteria, viruses and haptens. Haptens are molecules that may cause an immune response when they come in contact with a protein. All these cells and molecules are distributed in all the tissues of the body as well as lymphoid organs, which eliminate or prevent microbial infections to decrease the growth of tumours and start the repairing process of damaged tissues.
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Types of Immunity
Immune System fights against microbes and is divided into different types of reactions. The three types of immunity are:
Innate immunity
We all are born with innate (or natural) immunity, a type of natural protection.
The immunity, which is present in an organism by birth is called innate Immunity. Innate immunity refers to the body’s defence system.
For example, the skin, the barrier of the human body functions by protecting the entry of germs and other disease-causing pathogens.
Adaptive immunity
An individual acquires immunity after birth, hence is called adaptive or acquired immunity. Adaptive immunity develops throughout our lives. We acquire adaptive immunity when we are exposed to infectious diseases and allergies or when we are immunized against them with vaccines.
Passive immunity
Passive immunity is developed by antibodies that are produced outside the body. This immunity lasts for a short time. For example, antibodies present in a mother’s breast milk provide a baby with temporary immunity against diseases.
Active Immunity
Active immunity is a type of adaptive immunity, which is developed due to the production of antibodies in one’s own body. This type of immunity occurs when we are in contact with the pathogen or its antigen. When the immune system encounters an antigen for the first time and active immunity responds against it, it is called a primary response. Once a body experiences a pathogen for the first time, it keeps a few of the antibodies that attacked the pathogen just in case it attacks for the second time. This is known as natural active immunity.
3rd Answer:
IMMUNITY: Immunity is the ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells.
IMMUNE SYSTEM: Immune system is the organs and processes of the body that provide resistance to infection and toxins. Organs include the thymus, bone marrow, and lymph nodes.