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This Concept Map, created with IHMC CmapTools, has information related to: 28b1. Alveoli, ALVEOLI properties Pouch-like Evaginations -300 million / lung -70-80 sq. meters, Epithelium: Simple squamous see -Epithelial membranes (CaTOS-2), Respiratory portion of respiratory system part of Respiratory system, Epithelium: Simple squamous composed of Type I Pneuocytes -Do not divide -Make up 95% of alveolar surface Function: Gas exchange, Epithelium: Simple squamous composed of Type II pneumocytes -Also called septal cells -More numerous -But account for 5% of surface -Cuboidal in shape -Near a septum -Can divide, Type II pneumocytes -Also called septal cells -More numerous -But account for 5% of surface -Cuboidal in shape -Near a septum -Can divide structure -Bulge into alveolus -Have microvilli, Exocytosis -Forms lattice network known as tubular myelin -Not real myelin see -Neurons (CaTOS-2) -Schwann Cells (CaTOS-2), Rimmed by elastic fibers -Supported by retircular fibers involved with pathology of Emphysema, Separated from each other by Interalveolar pores -function: Serve as backup, Premature infants (ɟ mos) don't have surfactant -Suffer from respiratory distress -Is fatal treatments Glucocoticoid therapy, PULMONARY SURFACANT -Dipalmitoyl Phosphatidylcholine (DPPC) -Phosphatidylglycerol purpose Reduce surface tension of alveolar surface -Disrupts H+ -- O- attaction -Prevents alveolar collapse, Phgocytose matter -Like dust & bacteria after becomming filled, they Wander up to pharynx and are swallowed, or expectorated, Wander up to pharynx and are swallowed, or expectorated see Deglutitin (CaTOS-3), PULMONARY SURFACANT -Dipalmitoyl Phosphatidylcholine (DPPC) -Phosphatidylglycerol released by Exocytosis -Forms lattice network known as tubular myelin -Not real myelin, Glucocoticoid therapy stimulates Type II pneumocytes -Also called septal cells -More numerous -But account for 5% of surface -Cuboidal in shape -Near a septum -Can divide, Type II pneumocytes -Also called septal cells -More numerous -But account for 5% of surface -Cuboidal in shape -Near a septum -Can divide have Membrane bound lamellar bodies, Epithelium: Simple squamous composed of Macrophages, Resident connective tissue (CaTOS-2) jobs Produce elastase -Breaks down elastic fibers, PULMONARY SURFACANT -Dipalmitoyl Phosphatidylcholine (DPPC) -Phosphatidylglycerol clinical correlation Premature infants (ɟ mos) don't have surfactant -Suffer from respiratory distress -Is fatal, Thin regions -Blood air barriers -Gas exchange here -Fused basal laminae -Continuous capillaries see -Arteries (CaTOS-2)