lymphocytes are white blood cells that play a central role in adaptive immunity.
lymphocytes are white blood cells that play a central role in adaptive immunity.
white blood cells that plays a central role in adaptive immunity?
lymphocytes
section::::viruses and diseases.:host resistance.:adaptive immunity of animals.









































specific immunity to viruses develops over time and white blood cells called lymphocytes play a central role. lymphocytes retain a "memory" of virus infections and produce many special molecules called antibodies. these antibodies attach to viruses and stop the virus from infecting cells. antibodies are highly selective and attack only one type of virus. the body makes many different antibodies, especially during the initial infection; however, after the infection subsides, some antibodies remain and continue to be produced, often giving the host lifelong immunity to the virus.









































section::::viruses and diseases.:host resistance.:plant resistance.
introduction to viruses
in all vertebrates, there are two different kinds of immune responses: innate and adaptive immunity. innate immunity is used to fight off non-changing antigens and is therefore considered nonspecific. it is usually a more immediate response than the adaptive immune system, usually responding within minutes to hours. it is composed of physical blockades such as the skin, but also contains nonspecific immune cells such as dendritic cells, macrophages, and basophils. the second form of immunity is adaptive immunity. this form of immunity requires recognition of the foreign antigen before a response is produced. once the antigen is recognized, a specific response is produced in order to destroy the specific antigen. because of this idea, adaptive immunity is considered to be specific immunity. a key part of adaptive immunity that separates it from innate is the use of memory to combat the antigen in the future. when the antigen is originally introduced, the organism does not have any receptors for the antigen so it must generate them from the first time the antigen is present. the immune system then builds a memory of that antigen, which enables it to recognize the antigen quicker in the future and be able to combat it quicker and more efficiently. the more the system is exposed to the antigen, the quicker it will build up its responsiveness.
immunopathology