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The rhythmic contractions of smooth muscle down an esophagus is called peristalsis. The muscle contractions that help move the food down through the esophagus (and through much of the gastrointestinal tract) are called peristalticcontractions.

Interestingly, even if you are hanging upside down in a gravitational field (such as a kid hanging by his legs from the monkey bars), you can still swallow food and it will go to your stomach due to these contractions.

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11y ago
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14y ago

Muscle that is not controlled by individual volition; cardiac muscle and smooth muscle.

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9y ago

The word for an involuntary muscle contraction is a reflex. A good example is gently striking the knee and seeing the leg naturally lifted.

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11y ago

Abnormal involuntary muscle movements is known as Dyskineseas

Dyskinesia

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11y ago

Dyskinesia

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Q: What is the definition for involuntary muscle?
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