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How Does Air Travel Through The Body. But, before getting to your lungs, your brain needs to initiate breathing by sending a message through your nervous system to your muscles, diaphragm, and ribs, which ultimately allows your lungs to expand. The trachea divides into two bronchi.

heart and lungs
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As you breathe air in through your nose or mouth, it goes past the epiglottis and into the trachea. When we relax the muscles, air passes freely through the larynx. The air then follows narrower and narrower bronchioles until it reaches the alveoli.

heart and lungs

Airlines “pressurize” the air in. Oxygen and carbon dioxide are two invisible gases in air. One bronchus enters each lung. The alveoli enable the oxygen to be transferred into the blood.