What does the question mark represents in the given diagram?

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

MCQs on on digestive system, food digestion, digested products absorption and digestive system disorders.


What does the question mark represents in the given diagram?<br><img src='https://www.fatskills.com/images2/biology-questions-answers-digestion-food-1-q10.jpg' alt='Inner circular muscularis layer diagram' width='623' height='600' class='303019' />






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