Explain What Happens After Oxygen Enters The Lungs

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Carbon Dioxide/Oxygen Transport What happens after oxygen enters the lungs? As you breathe in oxygen your lungs expand, the intercostal muscles between your ribs, and enlarge the chest cavity. As oxygen enters your nose and mouth, known as inhalation, it travels down to the lungs passing the larynx, trachea, into the bronchial tubes and down into the alveoli. During this time the heart is pumping blood through the body including the lungs. The heart pumps low in oxygen and high in carbon dioxide through the pulmonary arteries. The pulmonary arteries end in capillaries which surrounds air sacs called alveoli, which sit at the end of the bronchial tubes. Oxygen-rich blood travels down the bronchial tubes into the alveoli. Gas exchange occurs

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