![]() ![]() What part serves as the entrance and exit of gases? In your lungs, the main airways (bronchi) branch off into smaller and smaller passageways - the smallest, called bronchioles, lead to tiny air sacs (alveoli). What are the smallest of the air distribution tubes? It passes through an opening in the diaphragm, called the esophageal hiatus, and then empties into the stomach. As it descends, it is posterior to the trachea and anterior to the vertebral column. The esophagus is a collapsible muscular tube that serves as a passageway between the pharynx and stomach. One bronchial tube leads to the left lung, the other to the right lung.ĭoes the esophagus enter or exit the pharynx? Your trachea is divided into 2 air passages called bronchial tubes. When you inhale through your nose or mouth, air travels down the pharynx (back of the throat), passes through your larynx (voice box) and into your trachea (windpipe).
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