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The muscles in the small intestine are smooth muscles and they are involuntary.

The muscles can be seen in the muscularis externa layer of the small intestine. Those muscles are arranged in two ways as outer is longitudinal and inner is circular way.  Those muscles help to do movements of small intestine.
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Answer:

The answer is smooth and Involuntary.

Explanation:

Smooth muscles are involuntary which means they automatically do a function without the brain telling it to.