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Vaccination:
Now let us see how vaccination protects us from disease. We have mentioned above that the W.B.Cs. produce antibodies which neutralise the toxins produced by the invaders. These W.B.Cs. are of different kinds and each kind consists of millions of cells which recognise and combat a specific foreign invader. Once a class of W.B.Cs. has encountered a particular kind of invader, it develops memory and is thus trained to ward off future attacks. In this way the body becomes "immune" to that infection and the process is called immunisation. Thus, our body regularly develops natural immunity as a variety of fighting cells are produced by actual attacks of infectious agents. Artificial immunisation is a clever idea. It is done through "vaccination", that is by artificial introduction into the body of a weak infection, which triggers off a defence mechanism, and produces W.B.C. trained to combat that particular infection.
the place of guidance and counselling in fostering stable growth and development in teaching and learning situation
Requirements Cell holder - 1 Bulb holder - 1 Wire - 1 Bulb (2.0 V) - 1 Cells (1.5 V) - 2 Plug (6/ 16 A) - 1 Screw driver - 1 Crocodile clips - 4 pair
Formation of the solar system: This theory is based on the assvmption that the Sun and all the planets were formed from a huge rotating cloud df interstellar gas and dust.
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In what ways does over-grazing lead to soil erosion?
Explain the Function of Nose You would agree that one of the most prominent features of the face is the nose. The nose is the first of the respiratory organs through which we r
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