Vocabulary List - Respiratory System

The bronchial tubes (bronchioles) are increasingly smaller airways . branching off into the lungs. 7. The diaphragm is a large domed sheet of muscle underneath the lungs that . is involved in breathing. 8. The ribs are curving flat bones that protect the organs in the chest. 9. The alveoli are air sacs in the lungs where the exchange of gases takes ................
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