The immune solution is how your human body recognizes and defends itself against bacteria, viruses, and also substances that appear foreign and also harmful.

You are watching: Which statement best describes an immune response

The immune system protects the human body from possibly harmful substances by recognizing and responding to antigens. Antigens space substances (usually proteins) ~ above the surface of cells, viruses, fungi, or bacteria. Nonliving substances such as toxins, chemicals, drugs, and foreign corpuscle (such as a splinter) can also be antigens. The immune mechanism recognizes and also destroys, or tries to destroy, substances that contain antigens.

Your body"s cells have proteins that room antigens. These encompass a group of antigens called HLA antigens. Your immune mechanism learns to check out these antigens together normal and also usually does no react against them.


Innate, or nonspecific, immune is the defense system with i m sorry you to be born. It protects you against all antigens. Inherent immunity involves obstacles that keep harmful materials from entering your body. These barriers kind the very first line the defense in the immune response. Instances of natural immunity include:

Enzymes in tears and skin oilsMucus, which traps bacteria and small particlesSkinStomach acid

Innate immunity likewise comes in a protein chemical form, called innate humoral immunity. Examples encompass the body"s match system and also substances referred to as interferon and interleukin-1 (which reasons fever).

If one antigen gets previous these barriers, the is attacked and also destroyed by various other parts that the immune system.


Acquired immune is immunity that creates with exposure to various antigens. Your immune device builds a defense against that certain antigen.


Passive immunity is as result of antibodies that are created in a body various other than her own. Infants have passive immunity due to the fact that they are born with antibodies that are transferred through the placenta from their mother. This antibodies disappear between ages 6 and also 12 months.

Passive immunization may also be as result of injection of antiserum, which includes antibodies that are formed by one more person or animal. It offers immediate protection versus an antigen, yet does not carry out long-lasting protection. Immune serum globulin (given because that hepatitis exposure) and tetanus antitoxin are instances of passive immunization.


The immune system includes certain varieties of white blood cells. It additionally includes chemicals and also proteins in the blood, such together antibodies, complement proteins, and interferon. Some of these directly assault foreign building materials in the body, and others job-related together to assist the immune mechanism cells.

Lymphocytes room a form of white blood cell. There are B and also T kind lymphocytes.

B lymphocytes become cells that develop antibodies. Antibodies connect to a particular antigen and also make it easier for the immune cell to ruin the antigen.T lymphocytes strike antigens straight and help control the immune response. They additionally release chemicals, well-known as cytokines, which regulate the entire immune response.

As lymphocytes develop, they generally learn to tell the difference in between your own body tissues and substances that are not normally discovered in her body. Once B cells and also T cells room formed, a couple of of those cells will certainly multiply and provide "memory" for your immune system. This permits your immune system to respond much faster and an ext efficiently the next time you room exposed to the exact same antigen. In many cases, it will protect against you from obtaining sick. For example, a person who has had chickenpox or has been immunized against chickenpox is immune from getting chickenpox again.

Watch this video about:Immune response


The inflammatory an answer (inflammation) occurs as soon as tissues room injured by bacteria, trauma, toxins, heat, or any kind of other cause. The damaged cells release chemicals consisting of histamine, bradykinin, and also prostaglandins. These chemicals cause blood vessels to leak fluid into the tissues, bring about swelling. This help isolate the foreign substance from further contact with body tissues.

The chemicals also attract white blood cells referred to as phagocytes that "eat" germs and also dead or damaged cells. This process is dubbed phagocytosis. Phagocytes at some point die. Pus is created from a collection of dead tissue, dead bacteria, and also live and dead phagocytes.

Watch this video clip about:Phagocytosis


Immune mechanism disorders take place when the immune solution is directed versus body tissue, is excessive, or is lacking. Allergy involve an immune response to a problem that many people"s bodies perceive as harmless.

See more: How Far Away Is Hawaii From California, Closest American State To Hawaii


Vaccination (immunization) is a way to cause the immune response. Tiny doses of an antigen, such as dead or weakened live viruses, are given to activate immune mechanism "memory" (activated B cells and also sensitized T cells). Memory enables your human body to reaction quickly and also efficiently to future exposures.

Watch this video about:Vaccines


An reliable immune solution protects against many diseases and disorders. One inefficient immune response permits diseases to develop. Also much, also little, or the wrong immune solution causes immune device disorders. One overactive immune solution can lead to the breakthrough of autoimmune diseases, in i m sorry antibodies form against the body"s very own tissues.

Complications from changed immune responses include:

Allergy or hypersensitivityAutoimmune disordersImmunodeficiency disordersTransplant rejection