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10 Cards in this Set

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Epithelium Type
Pseudostratified Columnar Ciliated Epithelium

*the respiratory system is evolutionarily derived from the digestive system, so we'll see a lot of goblet cells
Respiratory System Track (8)
Nose --> Pharynx --> Larynx (vocal cords - strat. squam.) --> Trachea (cartilage disappears from bronchi when the tube gets to about 1 mm and turns into) --> Bronchioles (cuboidal epithelium, which abruptly ends and turns into) --> Alveolar Duct (simple sqamous - won't be able to see from this point on), which turns into the Alveolus or the Alveolar Sac (involved in gas exchange)
Trachea (top to bottom)
Made up of hyaline cartilage, mixed glands, pseudostratified columnar ciliated epithelium, lumen, and smooth muscle which connects the two ends (during a cough, this muscle contracts). Large blood vessels may surround the trachea
In the Epithelium of the Trachea
-Cilia line the top, which move mucus out of lungs
-Goblet cells are underneath hat, which secrete mucus
-Random nuclei are underneath that
Bronchi
- (hyaline) cartilage "chunks" surround it
-smooth muscle
-still has mixed glands
-epithelium goes from pseudostratified to simple columnar
-has goblet cells and cilia within the epithelium
-when the diameter goes down to about 1 mm, all the hyaline cartilage disappears and it turns into the Bronchiole
Bronchiole
-few goblets
-no cartilage
-no glands (might be able to see some)
-columnar to cuboidal epithelium found here, NO CILIA
-smooth muscle surrounds it
Bronchiole structures (5)
-simple cuboidal cells lining it (NO CILIA) are called Clara cells (are clear - do not pick up much stain
-Terminal/Respiratory Bronchiole (b/c alveoli is present)
-Alveoli - blood vessels surrounding it
-Alveolar Duct (cuboidal stops abruptly here)
-Alveolar Sac
Alveolus
-Inside are Type II Pneumocytes, which secrete surfactant as do Clara cells. Surfactant is a mixture of phospholipids, is a detergent that decreases surface tension therefore allowing the lungs to expand. They have a nice round nucleus w/ good amount of cytoplasm
-On the outside are the Type I Pneumocytes, which are respiratory cells for oxygen and carbon dioxide exchange.
Smoker's Lung
Will see a lot of black particles, which are sometimes called dust cells. Alveolar macrophages are also present on this slide.
Lung
-Within the alveoli of the lung, you want low surface tension
-The Connective Tissue and Mesothelium found on the lung is composed of the parietal pleura, pleural cavity, and visceral pleura.
-The lung is expanded into the cavity b/c the CT and Mesothelium can remove air and liquid from the cavity
-If your lining of lung gets stabbed (if hole is present), then the lung will collapse due to pressue. Lung collapse = Pneumothorax