Which structure is NOT part of the "anatomical dead space"?

Name: Which structure is NOT part of the "anatomical dead space"?
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Question

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The anatomical dead space refers to the airways of the respiratory system that are not involved in gas exchange. This includes the trachea, bronchi, bronchioles, and terminal bronchioles. The respiratory bronchioles, however, are considered part of the respiratory zone where gas exchange occurs.

Which Structure Is NOT Part of the "Anatomical Dead Space