7. blood gas 2010

7. blood gas 2010 - Structure Trachea Bronchi Quantity 1 2...

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Structure Quantity Diameter Characteristics epithelial cells cartilage smooth muscle goblet cells Trachea Bronchi Bronchioles Alveoli 1 2 200 3,000,000 2cm 1.2cm 0.1cm 0.002cm no cartilage less smooth muscle fewer goblet cells single layer of elongated epithelial cells 4. Blood gas concentrations 1
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Control of radius of airways: i) Nervous – PNS (ACh) constrit - SNS (NE with Beta R m ) dilation ii) SNS – adrenal glands – Epi and NE iii) Paracrine (local) – epithelial cells iv) decrease inspired O 2 – cause dilation v) P Transmural –inspire increase radius - expire decrease radius vi) reflexes- protection from foreign particles 4. Blood gas concentrations 2
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Berne and Levy pg. 435 4. Blood gas concentrations 3
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4. Blood gas concentrations 4
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Blood flow within the pulmonary system: 1. Bronchial circulation - Part of the systemic circulation. - Supplies pulmonary structures with nutrients and removes waste. - Feeds everything in pulmonary system except the alveoli. 2. Pulmonary circulation From right ventricle through pulmonary artery (low O 2 , high CO 2 ) by alveoli (therefore close to atmospheric air)
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7. blood gas 2010 - Structure Trachea Bronchi Quantity 1 2...

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