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Chapter 21 set 3

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ts structure is defined by the presence of alveoli

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Terms in this set (26)

ts structure is defined by the presence of alveoli

this stucture begins as the terminal bronchioles lead respitory bronchioles which lead to alveolar ducts to terminals of alveoli sacs which is made up of alveoli

aprox. 300 million, accounts for most of the lungs volume
provides tremendous surface are for gas exchange

respitory membrane

The membrane separating alveolar air and blood, composed of the alveolar wall, the capillary wall, and their basement membranes

this area of the respitory member permits gas exchange ( diffusion)
-secretes angiotensin converting enzyme to surfactant ( type II cells)

what do the pores of alveoli do?

-connect adjacent alveoli
-allow air pressue in the lungs to be equalized
-has macrophages to keep the alveolar surface clean

the circulayions of the lungs are?

pulmonary and bronchial

supply systemic venous blood to be oxygenated, branch with bronchi, feed into pulmonary capilary network surrounding the alveoli

pulmonary arteries

carry oxygenated blood from respitory zones to the heart

pulmonary veins

This provides sytemic blood (oxygenated) to the lung tissue, except the alveoli

bronchial arteries

carry most of the venous back to the heart

pulmonary veins

whatbare the two phases of pulmonary ventilation?

inspiration and expiration

air flows into the lungs

air flows out of the lungs

inspiration is what type of transport