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16 Cards in this Set

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