9781422280317

Asthma, Cystic Fibrosis, andOther Respiratory Disorders

called the bronchi. The bronchi look like upside down trees, where a tiny “trunk” divides into as many as 30,000 tiny “branches.” When you breathe, your diaphragm contracts, moving downward into your abdomen. The negative pressure sucks air into your lungs and expands them. The air reaches the bronchi’s smallest branches, each of which end in a

The major parts of the respiratory system.

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