Which of the following allows air to pass into the lungs?

Answer 1

Hello! In our lungs are tiny sac-like structures called alveoli that is lined with a type of epithelial cell called simple squamous epithelium. This thin, single layer of epithelial tissue allows oxygen to diffuse easily through the walls of the alveoli into the lungs and in exchange carbon dioxide enters the alveoli to be expelled from our body when we breathe out.

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Answer 2

The Trachea would allow air to pass into the lungs.