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प्रश्न
How do the salivary glands come to know that there is food in the mouth and it is time to secrete saliva?
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उत्तर
Through the nerves present in the mouth, the brain comes to know that there is food in the mouth. The brain then gives orders to the salivary glands to secret the saliva. Thus when there is food in the mouth, automatic secretion of saliva takes place.
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