Anatomy and Cell Biology 2221 Lecture 28: ANATOMY-Respiratory2
30 Jul 2020
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Lower respiratory tract: pleurae: fluid-filled (serous) sacs, surround lungs. Lungs not inside pleurae but invested by them: visceral pleura: part of pleura covering lungs, parietal pleura: part of pleura not covering lungs, pleural cavity: space b/w parietal & visceral layers filled w/serous fluid. Function: pressure of pleural cavity lower that atmos pressure low pressure keeps lungs filling pleural cavity despite tendency of lungs to recoil (elasticity) Pneumothorax: collapse lung, air/fluid enters, increase pressure of pleural: lungs. Hilum: on mediastinal surface of each lung, where parietal/visceral meet. Pulmonary circulation: blood from heart to lungs for oxygenation, brought to heart. Pulmonary arteries, pulmonary veins, air passage (bronchi: deoxy blood returns from body to heart, deoxy pump from right ventricles to lungs via pulmonary arteries, blood percolates thorugh capillary beds (oxygenated, returns la via pulmonary veins to distribute body. Primary bronchi: enters at hilum (right shorter, wider) Tertiary bronchi: each lung has 10: supply bronchopulmonary segment, can be removed.
