What is the immune system? The purpose of the immune system is to maintain the infectious microorganisms, such as certain bacteria, viruses and fungi, with the body and destroy any infectious microorganisms that make the invasion of the body. The immune system consists of a complex and vital network of cells and organs that protect the body from infection. Bodies associated with the immune system are called lymphoid organs, affecting growth, development and yield of lymphocytes (a type of white blood cells). Blood vessels and lymphatic vessels is an important part of the lymphoid organs, because they are lymphocytes and from different regions of the body. Each lymphoid organ plays an important role in the production and activation of lymphocytes. Lymphoid organs include:
blood vessels (arteries, veins and capillaries through which blood flows)
bone marrow (soft, fatty tissue found in bone cavities)
lymph nodes (organs Small form as beans, which are located throughout the body and connect via the lymphatic vessels)
Which lymphocytes? Lymphocytes - a kind that fight infection white blood cell - are vital for effective immune system. Lymphocytes "patrol" the body for infectious microorganisms. As lymphocytes formed? All cells, including immune cells such as lymphocytes, are produced in the bone marrow (soft, fatty tissue found in bone cavities). Some cells become part of a group of lymphocytes, while others will become part of another type of immune cells known as phagocytes. Once the lymphocytes are initially formed, some will continue to mature in the bone marrow and become "B" cells. Other lymphocytes will end their maturation in the thymus and become "T" cells. B and T cells into two major groups of lymphocytes which recognize and attack infectious microorganisms. Once mature, some lymphocytes will be placed in the lymphoid organs, while others will travel continuously around the body through the lymphatic vessels and blood. How do lymphocytes fight infection? Although each type of lymphocyte fights infection differently, in order to protect the body from infection remains the same. B cells actually produce specific antibodies to specific infectious microorganisms, while T cells kill pathogenic bacteria by killing cells of the body that is affected. In addition, T cells release chemicals called lymphokines that cause the immune lasix buy response against cancer or virus, for example. Other types of white blood cells such as phagocytes (absorption cells) and cytotoxic cells (natural killer), actually kill the infectious microorganism by "devouring" it. What is natural and acquired immunity? The immune system has many different duties. Moreover, the immune system provides protection from infection through natural barriers, but also adapted to provide immunity against infection "remember" infectious microorganisms from previous exposure. The extent and duration of immunity depends on the type and quantity of antigen and how it enters the body. create natural barriers of the body such as skin, and protective substances in the oral cavity, urinary tract and on the surface of the eye. Another type of natural immunity in the form of antibodies passed from mother to child. developed under the influence of specific foreign microorganisms, toxins, and / or foreign tissues), which "remembers" the immune system. When that antigen enters the body again, the immune system "remembers" how to respond to it, such as vitryantsi. Once a person is exposed to chickenpox or chickenpox vaccine, the immune system produces antibodies against chickenpox. When the same person is exposed to chickenpox again, the immune system will trigger the release of such antibodies to fight disease vitryantsi. What are the compromised immune system? When the immune system is not functioning properly, it leaves the body susceptible to an array of diseases. Allergy and sensitivity to certain substances are considered immune system disorders. In addition, the immune system plays an important role in the rejection of transplanted organs and tissues. Other examples of immune disorders include:
autoimmune diseases such as juvenile diabetes, rheumatoid arthritis, anemia
immune complex diseases such as viral hepatitis and malaria
immunodeficient diseases such as acquired immunodeficiency syndrome (AIDS )
What is an infectious disease? According to the Centers for Disease Control and Prevention (CDC), an infectious disease caused by one or more of the following:
Infectious diseases can range from common illnesses like cold, deadly diseases such as AIDS. Depending on the specific illness and country (in some countries with poor hygiene community can still feel the water transmission of disease), infectious diseases may spread to some or all of the following ways:
sexual transmission - transmission of infection through sexual contact, including communication
airborne droplets - transmission via inhalation of air droplets disease that may exist in the air by coughing or sneezing infected person
blood transmission - transmission of infection through contact with infected blood, such as sharing syringes
insect transmission - transmission through insects such as mosquitoes, which draw blood from an infected person and then biting a healthy person
In developed countries, most infections are spread sexually in the air, blood-borne, and direct transfer of contact with skin. What is the difference between viruses and bacteria? Viruses and bacteria cause most infections. Viruses cause most colds, flu, cough and sore throat. Bacteria cause most ear and sinus, strep throat and urinary tract infections. As bacteria and viruses can penetrate the body in various ways, including through the respiratory, food, sex and contact with skin. How do antibiotics work against infections? Antibiotics can be used to treat bacterial infections. However, antibiotics are ineffective in treating virus diseases. In addition, antibiotics treat specific bacteria and excessive or improper use of antibiotics can lead to drug-resistant bacteria. It is important that antibiotics are taken properly and for the duration period. If antibiotics are stopped before the bacteria can develop resistance to antibiotics. .
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