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| Description: Respiratory Membrane The respiratory membrane is composed of: A layer of type I and type II alveolar cells and associated alveolar macrophages that constitutes the alveolar wall An epithelial basement membrane underlying the alveolar wall A capillary basement membrane that is often fused to the epithelial basement membrane The capillary endothelium Blood enters the lungs via the pulmonary arteries (pulmonary circulation) and the bronchial arteries (systemic circulation) Blood exits the lungs via the pulmonary veins and the bronchial veins Ventilation-perfusion coupling Vasoconstriction in response to hypoxia diverts blood from poorly ventilated areas to well ventilated areas Picture Stats: Views: 180 Filesize: 680.93kB Height: 712 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40813 |