ANSC 3080 Lecture Notes - Lecture 10: Respiratory Epithelium, Respiratory Tract, Bronchus
18 Oct 2016
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Respiratory function = gas transport for metabolism, o2 from air to pulmonary blood, clearance of co2. = lungs receive 95% cardiac output (r heart) = filter blood, chemical processing, maintenance and defenses (part of first line of defense) Respiration = interchanges of gas btw atmosphere and cells of body. Ventilation (breathing) = transport of air to and from lungs. Gas exchange = o2/co2 exchange btw air in lungs and cells in body. Cellular respiration = oxidation of cellular molecules that produce co2, water and atp. Overall gas transport: ventilation: movement of bulk airflow, delivering air to respiratory zone where gas exchange occurs. Lung diffusion: gas exchange btw respiratory zone and blood (o2 and co2 diffuse through lipid bilayer: o2 moves across alveolar membrane rbcs, reverse process for co2. Circulation: (blood tissues) requires adequate function of pulmonary and systemic circulations. Tissue diffusion: erythrocyte/plasma tissue cells = passive diffusion. Internal respiration: metabolism using o2 and producing co2.
