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Q. What are active and passive immunization? According to the duration of the protection how do these types of immunization differ?
Active immunization is that in which an antigen penetrates the body triggering the primary immune response and the production of antibodies and memory lymphocytes that provide faster and more effective immune defense in future infections by the same antigen. Passive immunization is that in which immunoglobulins against an antigen are inoculated in the body to provide protection in case the body becomes polluted by the antigen.
Active immunization tends to be longer lasting than passive immunization since in the active type as well as specific memory lymphocytes, antibodies remain in the circulation. In the passive immunization the duration of the protection is the duration of the antibodies in the circulation.
Q How different is the amphibian heart from the fish heart? The fish heart has only two chambers, a ventricle and an atrium, and the blood that comes to it is purely venous.
before stem cuttings are planted the cut end of the stem is often dipped in a hormone powder .what is the point of this?
Explain about Urinary system Urinary system provides us with the service of disposing the waste products carried by blood. This function is also known as excretion.
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