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Two alveoli of the lung, highly magnified. Alveoli are cavities which are honeycombed with bulgings in order to increase the surface area exposed to air and covered by capillaries. Labels: b,b, bulgings of the alveoli, a, a.

Two Alveoli of the Lung

Two alveoli of the lung, highly magnified. Alveoli are cavities which are honeycombed with bulgings…

Two infundibula of the lung much magnified. Labels: b, b, hollow protrusions of the alveolus, opening into its central cavity; c, terminal branches of a bronchial tube.

Infundibula of the Lung

Two infundibula of the lung much magnified. Labels: b, b, hollow protrusions of the alveolus, opening…

Section of lung, showing general relations of division of air tubes.

Section of Lung Showing General Relations of Divisions of Air Tubes

Section of lung, showing general relations of division of air tubes.