LYMPHATIC
LYMPHATIC SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Only allergens create lifetime immunity.
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Viruses change quickly and frequently.
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Viruses do not create immune responses.
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Allergens mutate frequently.
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Detailed explanation-1: -Unlike active immunity, passive immunity provides immediate protection. But that protection is generally short-lived, as the supply of antibodies is not being replenished like they would be in someone whose own immune system was generating them.
Detailed explanation-2: -The major advantage to passive immunity is that protection is immediate, whereas active immunity takes time (usually several weeks) to develop. However, passive immunity lasts only for a few weeks or months. Only active immunity is long-lasting.
Detailed explanation-3: -In many cases, acquired immunity is lifelong, as with measles or rubella. In other instances, it can be short-lived, lasting not more than a few months. The persistence of acquired immunity is related not only to the level of circulating antibody but also to sensitized T cells (cell-mediated immunity).