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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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repitory zone
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Respitory zone
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Terms in this set (26)
ts structure is defined by the presence of alveoli
repitory zone
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
respitory zone
aprox. 300 million, accounts for most of the lungs volume
provides tremendous surface are for gas exchange
alveoli
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)
Alveolar wall
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
inspiration
air flows out of the lungs
expiration
inspiration is what type of transport
active