A ________ is a central, open area inside a tubular structure, such as the esophagus, small intestine, and large intestine
A) haustra
B) lumen
C) sphincter
D) fundus
Ans: B) lumen
Explanation: A) Haustra are pouches in the large intestine.
B) Correct!
C) A sphincter is a muscular ring around a lumen.
D) The fundus is only in the stomach.
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