Try to swallow the saliva in your mouth, and feel by your hand in your neck. What happens in the neck?

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Solution

Whenever we swallow anything (Food or Saliva) there is a movement of the muscles inside the neck. This movement is called Peristalsis which is actuaaly the muscular contraction and relaxation of smooth Muscles. This movement helps in forcing the food /Saliva inside Oesophagus (food pipe)

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