NUR 3100 Lecture 12: SI -- Respiratory Disorders

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NUR 3100
Tara Konicki

Respiratory, Gas exchange Laryngotracheal airway = speech and lung protection 1. Aspiration: foreign object into the lungs Alveolar circulation a) Arteries: DO2 b) Veins: O2 c) Alveolar structures: a) Type 1 alveolar cellspneumocytes_thin squamous_ cells with a flat nucleus. b) Type 2: _cuboidal_ cells between type 1 that create surfactant (surfactant: surrounds the lung and reduces tension) c) Macrophages: present in connective tissue and air spaces, remove offending substances for alveoli, can encapsulate insoluble material (TB encapsulation, storage for life = pos. TB test) Bronchial circulation a) Important for _gas exchange_!!! b) Removes thrombi from circulation, functions as metabolic organ, blood reservoir for the heart Inspiration: pressure _decreases_ Expiration: pressure _increases_ Ventilation (V) a) Pulmonary: atmospheric gas exchange in the _lungs_ b) Alveolar: gas exchange in the _alveoli_ Perfusion (Q) a) Blood flow through the pulmonary capillary bed. b) Pulmonic perfusion affected by position 500 ml per heartbeat Gas exchange is normally 1:1 ratio a) Dead Air Space: v>q meaning there is ___________ but less than normal ______________ b) Shunt: v
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