All of us have had the experience of being thirsty at times, but can you imagine how it would feel to be thirsty for days? If a human being has absolutely nothing to drink for five to six days, he will die. Feeling thirsty is simlpy our body's way of telling us to replenish its liquid supply. The reason for this thirst is caused by a change in the salt content of our blood. There is a certain normal amount of salt and water in our blood. When this changes by having more salt in relation to water in our blood, thirst result. There is a part of our brain called the ' thirst centre'. It responds to the amount of salt in our blood. When there is a changes, it sends messages to the back of the troat. From there, message go to the brain, and it is this combination of feelings that makes us say we are thirsty.
FACT FILE
Onions sendout an irritating subtance when we peel them. The onion has an oil containing sulphur which not only gives it its sharp odour, but it also irritates the eye. The eye reacts by blinking and producing tears to wash it away. That is why we cry when we peel onions.
resources: Tell me Why (Chancellore Press)
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