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Physiology
Lungs
Lungs (2)
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Created by
Jessica adejko
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Cards (6)
Approx.
300
million alveoli
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Alveoli
Lined with
lipoprotein
(surfactant) which is a mix of phospholipids and
protein
Contain
epithelial
cells
Type 1 alveolar cells have
thin
cell walls and are for
gas exchange
Type 2 alveolar cells secrete
surfactant
and have
microvilli
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Alveolar
surfactant
Lowers
surface tension at the
air
/liquid interface
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Air movement into lungs
1.
Pressure
changes
2.
Pressure
is the amount of force created by movement and collision of the
gas
molecules
3. Flow =
pressure difference
/ resistance
4. Pressure difference =
atm
pressure
– alv pressure
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Inhalation
Always
active
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Exhalation
1. Can be
active
or
passive
2. Lungs naturally recoil so exhalation restores the lungs to their
resting
position
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