PHSL 3051 Lecture Notes - Lecture 20: Transpulmonary Pressure, Respiratory Tract, Cellular Respiration
Document Summary
Exchange of gases between atmosphere and the blood. Protection from inhaled pathogens and irritating substances. External respiration: ventilation exchange 1. Air to lungs: pulmonary gas exchange exchange 2. Lungs to blood: transport of o2 and co2: transport of gas in blood, systemic gas exchange exchange 3. Epithelial cells line the inside, lining airways. Cilia move the mucus layer towards the pharynx, removing trapped pathogens ann particulate matter. Conducting zone: bring air in and out of body. Cross-sectional area gets larger, diameter becomes smaller. Cross-sectional area gets larger, diameter gets smaller. Bronchiole is covered in smooth muscle for control of radius. Each cluster of alveoli is surrounded by elastic fibers and a network of capillaries. Blood from right side comes in, then pumped out into the left heart after oxygenation. Type 2 alveolar cell: secretes surfactin (helps reduce surface tension) Co2 into alveoli, o2 out back into capillaries. Increase in capillary permeability intracellular clefts widen.
