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What does the question mark in the given diagram represent?

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MCQs on animal tissues, animals organs and organ system, earthworm, cockroach and frogs.


What does the question mark in the given diagram represent?<br><img src='https://www.fatskills.com/images2/zoology-problems-q13.jpg' alt='Cardiac muscle adjacent cells diagram' width='557' height='492' class='303078' />






 
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