The respiratory bronchioles are the narrowest airways of the lungs, 0.5 mm across. The bronchi divide many times before evolving into the bronchioles. The respiratory bronchioles deliver air to the exchange surfaces of the lungs. They are interrupted by alveoli which are thin walled evaginations. Original edition from my own archives Source : Historia Natural 1886
Fotos do Sistema Respiratório com ilustração de árvore brônquica pulmonar 1886 Royalty Free
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