BIOL273 Lecture Notes - Lecture 5: Alveolar Cells, Pulmonary Artery, Pulmonary Circulation

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28 Apr 2020
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Multicellular organisms need a specialized organ coupled with the circulatory system. Composed of structure involved in both ventilation and gas exchange: conducting system airway, exchange surface alveoli, pumping system bones and muscles of thorax, conducting system. Passages or airways lead from environment to the exchange surface of the lungs. Respiratory system can be divided into two parts: upper respiratory tract, mouth, nasal cavity, pharynx, larynx, lower respiratory tract, trachea, bronchi, bronchioles, lungs, exchange surface. Sites of gas exchange the alveoli. Tiny hollow sacs found at the ends of the terminal bronchiole. Wrapped with an extensive capillary network which covers 80-90% of the alveolar surface. Gas exchange occurs by diffusion between alveoli and capillary. Two types of alveoli cells: type 1 alveolar cells large but thin, rapid gas diffusion, type ii alveolar cells smaller but thicker, synthesize and secrete surfactant. Blood vessels of the pulmonary circulation allow for exchange with alveoli.

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