Эл. №ФС77-60625 от 20.01.2015
Презентация к УМК "Здоровый образ жизни"
Описание презентации по отдельным слайдам:
Leukocytes are produced or stored in many locations in the body, including the thymus, spleen, and bone marrow. For this reason, they are called the lymphoid organs. There are also groups of lymphoid tissue in the body, primarily in the form of lymph nodes, that house the leukocytes. The leukocytes circulate through the body between the organs and nodes by means of the lymphatic vessels. Leukocytes can also circulate through the blood vessels. In this way, the immune system works in a coordinated manner to monitor the body for germs or substances that might cause problems.
Innate Immunity Everyone is born with innate immunity, a type of general protection that humans have. Many of the germs that affect other species don't harm us. For example, the viruses that cause leukemia in cats or distemper in dogs don't affect humans. Innate immunity works both ways because some viruses that make humans ill — such as the virus that causes HIV/AIDS — don't make cats or dogs sick either.
Innate immunity also includes the external barriers of the body, like the skin and mucous membranes (like those that line the nose, throat, and gastrointestinal tract), which are our first line of defense in preventing diseases from entering the body. If this outer defensive wall is broken (like if you get a cut), the skin attempts to heal the break quickly and special immune cells on the skin attack invading germs.
Adaptive Immunity We also have a second kind of protection called adaptive (or active) immunity. This type of immunity develops throughout our lives. Adaptive immunity involves the lymphocytes and develops as children and adults are exposed to diseases or immunized against diseases through vaccination.
Passive Immunity Passive immunity is "borrowed" from another source and it lasts for a short time. For example, antibodies in a mother's breast milk provide an infant with temporary immunity to diseases that the mother has been exposed to. This can help protect the infant against infection during the early years of childhood.
Things That Can Go Wrong With the Immune System Disorders of the immune system can be broken down into four main categories: immunodeficiency disorders (primary or acquired); autoimmune disorders (in which the body's own immune system attacks its own tissue as foreign matter); allergic disorders (in which the immune system overreacts in response to an antigen); cancer of the immune system.
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