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Lecture 12

MEDT220 Lecture 12: Chapter 12 –respiratory system

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Medical Laboratory Sciences
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Chapter 12 respiratory system Respiration Main function of respiratory system: o Movement of oxygen from the outside air to the cells within tissues and transport of carbon dioxide in the opposite direction Two processes: o External respiration o Internal respiration External respiration: exchange of air at the lung capillaries o oxygen inhaled into the air spaces of the lungs o immediately passes into capillaries surrounding air spaces o carbon dioxide passes from capillaries into air sacs, to be exhaled o Inhaled air = 21 O 2 o Exhaled air = 16 O 2 Internal respiration: exchange of gases in the cells o occurs simultaneously between cells and tissue capillaries o oxygen passes out of the bloodstream into the tissues o carbon dioxide passes out of tissues back into the bloodstream to travel to the lungs for exhalation Nose o air enters body through two openings = nostrilsnares Nasal cavity o lined with mucous membranes to warm and moisten air o lined with cilia to filter out foreign bodies Epiglottis
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