A hungry person salivates on smelling or thinking of food, while a well fed person seldom do that.
Dear student,
Your question is not clear but I am answering assuming the question to be 'Why do we salivate on smelling or thinking of food while hungry.' Please find below the answer:
When we sense food or even think about it, we start to secrete saliva because this is set in brain reflex which triggers it, and in response to this brain sends impulses via nerves that control the salivary glands. The secretion of the saliva is under the control of the medulla oblongata.
Hope this clears your doubt.
Regards.
Your question is not clear but I am answering assuming the question to be 'Why do we salivate on smelling or thinking of food while hungry.' Please find below the answer:
When we sense food or even think about it, we start to secrete saliva because this is set in brain reflex which triggers it, and in response to this brain sends impulses via nerves that control the salivary glands. The secretion of the saliva is under the control of the medulla oblongata.
Hope this clears your doubt.
Regards.