BLG 10A/B Lecture Notes - Lecture 22: Alveolar Cells, Bronchiole, Pseudostratified Columnar Epithelium

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Respiratory system: major functions: supply body with o2 for cellular respiration and dispose of co2, a waste product of cellular. Pulmonary ventilation (breathing): movement of air into and out of lungs. External respiration: exchange of o2 and co2 between lungs and blood: circulatory system. Internal respiration: exchange of o2 and co2 between systemic blood vessels and tissues. Trachea (windpipe) extends from larynx into mediastinum, where it divides into two main bronchi: wall composed of three layers, mucosa: ciliated pseudostratified epithelium with goblet cells. Submucosa: connective tissue with seromucous glands supported by 16 20 c- shaped cartilage rings that prevent collapse of trachea: adventitia: outermost layer made of connective tissue. Air passages undergo 23 orders of branching: branching referred to as bronchial tree. From tips of bronchial tree: conducting zone structures give rise to respiratory zone structures. Trachea divides to form right and left main (primary) bronchi. Each main bronchus enters hilum of one lung.

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