Category A - full version without watermark 720x576 (check terms and conditions at The version with watermark is for free to embed. This mechanical action has to do with sets of muscles that cooperate to move both liquid and solid food along the digestive tract. In other word, it pushes food along your esophagus, stomach, and intestine.. Gravitational pull is lessened in a sense when food enters the esophagus because of peristalsis. Peristalsis helps a person to swallow lying down or even standing on their head. Peristalsis has another essential task besides assisting in the movement of food through the body. It also helps to knead, agitate, and pound the solid residue that is left after the teeth or those without teeth, the gums, have done their best.