Answers

2015-10-24T18:02:08+05:30
It is a flap or lid like valve tube and protects the wind pipe by arresting the entry of food.

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2015-10-24T19:27:08+05:30
Actually oesophagus is a muscular tube. it's function is to transport food from the pharynx to the stomach. when food is chewed and mixed with saliva then it becomes a blood bolus. then the muscles contract at the top and push the bolus forward this contraction moves forward like a wave, pushing the bolus into the stomach.
The rhythmic, wave-like contraction of the digestive tract that forces food through it this is the process by which food is transported. the process is called peristalis.
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