What does the question mark represents in the given diagram?

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Class 11 Biology Practice Test: Digestion and Absorption - Digestion of Food — practice the complete quiz, review flashcards, or try a random question.


What does the question mark represents in the given diagram?<br /><img src='https://www.fatskills.com/class11science/biology-questions-answers-digestion-food-1-q10.jpg' alt='The inner circular muscularis layer' width='400' height='400' />






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