BIOL 2510 Lecture Notes - Lecture 5: Stratified Squamous Epithelium, Lung, Bronchus

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Major functions of the respiratory system: supply the body with oxygen and dispose of carbon dioxide (respiration, carry out gas exchange, produce sound. Pulmonary ventilation: inhaling oxygen and exhaling carbon dioxide (breathing) Gas exchange: oxygen loading and carbon dioxide unloading. External respiration: occurs between the lungs and the blood. Internal respiration (cellular respiration): occurs between the blood and tissue cells. Transport: transport of oxygen and carbon dioxide between lungs and tissues via blood. Upper respiratory system consists of: nose, nasal cavity, paranasal sinuses, pharynx. Function zones: respiratory zone, site of gas exchange. Includes bronchioles, alveolar ducts & alveoli (air sacs of lungs-microscopic: conduction zone, provide and air passage way to reach sites of gas exchange, warms, humidifies, and cleanses inspired air. Include nose, nasal cavity, pharynx, trachea, and bronchi. Goblet cells: produce mucus, clean exposed surfaces, found in mucous membranes that lines respiratory system. Cilia: found in trachea, sweeps debris containing mucus towards pharynx.

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