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Ghtens to create sound when air moves past trachea is

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Unformatted text preview: e volume is occupied by mostly air- filled spaces •  Lung is surrounded by pleural membrane (elas(c connec(ve (ssues and capillaries, opposing layers of which are filled with pleural fluid) –  Air filled balloon (lungs) surrounded by a water filled balloon (the pleural sac) •  Air enters through mouth and mouse and passes through pharynx (common for food, liquid, and air) to larynx (air only) into trachea or windpipe –  Larynx contains vocal cords, connec(ve (ssue band that (ghtens to create sound when air moves past •  Trachea is held open by rings, extends into thorax where it branches (division 1) into primary bronchi, one bronchus to each lung, and into progressively smaller bronchi –  Bronchi are semi- rigid tubes •  In the lungs (!!), the smallest bronchi branches become bronchioles, small collapsible passageways with walls of smooth muscle –  Bronchioles con(nue branching, more branching increases cross- sec(onal surface area, similar to going from aorta to capillaries Surfactant: Lipoprotein secreted onto alveolar surfaces that decreases surface tension and helps air exchange, more surface tension on smaller alveoli What do airways to do inspired air? •  Warm it (to body temperature so that core body temperature doesn’t not change and alveoli...
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