09.16 Respiratory track Flashcards
1
Q
A
- Seromucinous glands (resembling salivary glands) are present in mucosa of the nasal cavity for lubrication
2
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A
glands (cells) organized in circular structures in the nasal cavity.
3
Q
A
Bowman’s glands
4
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A
trachea has pseudostratified epithelium, seromucous glands, and cartilage.
5
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A
trachea also has goblet cells for mucus
6
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A
trachea epithelium is ciliated and pseudostratified.
7
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A
ciliated trachea epithelium
8
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A
bronchus has smooth muscle for contraction
9
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A
bronchus has smooth muscle for contraction and cartilage for structure support
10
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A
bronchiole also has smooth muscle
11
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A
bronchioles have simple columnar or cuboidal ciliated epithelium with no goblet cells.
bronchiole also have smooth muscle
12
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A
- Clara cells
i. Protect the bronchiolar epithelium by secreting a small varieyt of producs, including Clara cell secretory protein (CCSP) and a component of the lung surfactant
13
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A
simple squamous epithelium (very thin) for gas exchange.
14
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A
- Gas molecules diffusing from alveolar air space to capillary lumen (or vice versa) must pass through the alveolar epithelium and the capillary endothelium as well as the intervening basement membranes.
15
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A
16
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A
- Type I pneumocytes: squamous epithelial cells of the alveolar walls that are stretched out thin
i. Flattened for gas exchange
ii. Covers 95% of the alveolar surface but only accounts for about 40% of pneumocyte population
17
Q
A
- Type II pneumocytes: larger cuboidal cells scattered among the type I pneumocytes, which secrete surfactant.
i. Cuboidal and produces surfactant
ii. Constitutes about 60% of the pneumocytes but only 5% of the surface area
