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16 Cards in this Set
- Front
- Back
What does the repiratory portion of the respiratory system consist of?
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respiratory bronchioles, alveolar ducts, and pulmonary alveoli
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what happens in the respiratory portion to the epithelium?
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much thinner than in the conducting portion, thus facilitating gas diffusion between pulmonary capillaries and the respiratory structures.
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What happens in the pulmonary capillaries and the respiratory structures?
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gas diffusion
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Terminal bronchioles branch to form what?
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respiratory bronchioles
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What do respiratory bronhcioles turn into eventually?
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continue to divide until they form thin airways called alveolar ducts, which in turn terminate in a dilated alveolus
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Where do the alvolar ducts terminate?
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in a dilated alveolus
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What is an alveolar duct?
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a small airway: branch that comes from the respiratory bronchioles
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Where do the alveoli arise from?
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Both the respiratory bronchioles and the alveolar ducts
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Both the respiratory bronchioles and the alveolar ducts contribute to what?
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alveoli
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What do the alveoli do?
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specialized to promote diffusion of gases between the alveoli and the surrounding pulmonary capillaries
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what gases are exchanged in the lungs?
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CO2 and O2
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Where does O2 diffuse from and where does it go?
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diffuses from the alveoli into the pulmonary capillaries so it can be carried by erythrocytes to the body's metabolically active tissues.
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C02 diffuses out of what and why?
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diffuses out of the pulmonary capillaries into the alveoli so it can be exhaled.
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What is the spongy nature of the lungs due to?
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the packing of millions of alveoli together
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What are alveolar macrophages?
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ddust cells migratory cells that continually crawl within the alveoli, engulfing microorganisms or particulate material that has reached the alveoli.
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what are the migratory cells that continually crawl within the alveoli, engulfing microorganisms or particulate material that has reached the alveoli?
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alveolar macrophages.
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