Question
Why is it so, that food does not pass through the digestive system by 'gravity', but still we are able to digest food even when we are lying down? Explain how food passes through our digestive system?

Answer

The lining of the oesophagus, stomach and intestine is muscular, these help in pushing food through it easily by its own by peristalsis movements. These movements of muscles help the food to pass through along the whole alimentary canal.

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