Alveolar-Capillary Unit & Pleura

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Last updated 7:21 AM on 8/25/26
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4 Terms

1
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What occurs at the alveolar-capillary unit?

  • O₂ diffuses:

    • Alveoli → blood

  • O₂ binds hemoglobin

  • CO₂ diffuses:

    • Blood → alveoli


2
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What is the visceral pleura?

  • serous membrane

  • Directly covers each lung


3
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What is the parietal pleura?

Covers inner surfaces of:

  • Chest wall

  • Ribs

  • Vertebrae

  • Diaphragm

  • Mediastinum


4
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What separates the visceral and parietal pleura?

  • Thin layer of serous fluid

  • Normally keeps pleural surfaces in close contact

  • Abnormal space may contain:

    • Air → pneumothorax

    • Blood → hemothorax

    • Excess serous fluid → pleural effusion