Download I Wonder Why by Neeraja Raghavan PDF

By Neeraja Raghavan

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Extra resources for I Wonder Why

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For explanation of how the nervous system works) and make us feel less pain. It is quite likely that one or more of these theories work at any given time and, when we take more than one medicine at a time, each of these probably works in a different way. While one drug may work by killing the germs, another may just weaken the germs so as to allow the body's natural defences to take over. What does 'natural defences' mean? This means the chemicals produced in our body naturally. Some of these may themselves work towards fighting diseases, and when the disease-causing germs are weakened, we may be able to recover from our illness by way of weakening the germs with the help of medicines.

The first and most obvious reaction to this is laughter. In addition the pulse quickens, the blood pressure rises, and the body becomes alert. Try this out: sit in a group of people, all of whom you should not know. Close your eyes and ask any one of them to tickle you. See how you react! ' Laughter And Tears What makes people laugh? You would be surprised but scientists are still trying to find out the answer. In fact, the best explanations that we have are still only theories, without any firm evidence.

Take a simple example. If a person sees a tiger on his path, it will not take him/her long to run for his/her life! The person's reaction may take only an instant, but the reaction actually is the result of many complicated processes within the nervous system. Since these take hardly any time, we seldom think about them. As shown in the illustration, in a stepwise manner, these are the things which occur: • There are special neurons in the eye which translate the light rays that reflect off the tiger into nerve messages.

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