The digestive system

Written by Jayowobo / NR: Not Rated / 8.00 (2 ratings) (2)
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As you push the food into your esophagus, your job is over and the smooth muscles help to push the food down into your stomach, with sphincter rings preventing it from coming back up.

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Room 134616 created by Jayowobo on Apr 10, 2018
Previous Rooms: 134608