write the function of circularl muscle?
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“Peristalsis” implies that the circular muscle contraction travels as a wave along the esophageal lumen to create a traveling contraction wave and a moving point of luminal closure that forces the bolus fluid ahead, and ultimately into the stomach
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Circular muscles surround each segment. When earthworms squeeze these muscles, they become long and thin. Circular muscles alternate with longitudinal muscles to help earthworms move.
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