tightens
peristalsis
Peristalsis.
Peristalsis
I guess you mean the heart?
Perastalsis, the wave of muscular contractions that moves food through the entire digestive system.
Peristalsis is a series of muscular contractions which moves food, in its various stages of digestion, through the alimentary canal.
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Food moves through the digestive tract as a result of peristaltic motion, or peristalsis.
It goes through the pharynx (throat), esophagus, stomach, small intestine and large intestine.After food passes through the throat, it moves into the esophagus. The esophagus is a muscular tube that brings food to the stomach.
Muscular system