BIO202 - Ch 22 - Lungs, Pleurae - Marieb/Hoehn - RioSalado - AZ
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| Site where conducting zone structures give way to respiratory zone structures. | Bronchial tree
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| The divisons of the trachea at T7 are? | R & L main (primary) bronchi
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| The __ main bronchus is wider, shorter, & more vertical & is common site for inhaled foreign object to lodge. | right
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| Tree subdivisions off main bronchus continue as? | Bronchus, lobar bronchi, segmental (teritary) bronchi, bronchioles (1mm), terminal bronchioles (0.5 mm).
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| As conducting tubes become smaller __. | (1) cartilage rings change to plates, (2) epithelium change from ciliated to cuboidal, (3) amount of sm. muscle increases.
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| Respiratory zone begins where? | As terminal bronchioles feed into respiratory bronchioles, from which protrude the alveoli.
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| Walls of alveoli are composed of __. | Type I cells - single layer of squamous epithelial cells & Type II cells - cubodial that secrete surfacant.
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| __ crawl freely along internal alveolar surfaces. | Alveolar macrophages
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| The narrow superor tip of lung is the __ & inferior that rests on diaphragm is the __. | apex/base.
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| Why do the 2 lungs differ in size? | Left lung is smaller due to the cardiac notch that accomadates the heart.
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| Bronchopulmonary segments | Pyramid-shaped segments of lobe that are separated from one another - Each starts w/10 & disease confined to one or a few segments - can be removed w/o damaging nearby segments.
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| Smallest subdivisions of lungs visible to naked eye. | Lobules - hexagons about size of pencil eraser.
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| The rest of lung tissue, or stroma, is mostly __. | elastic CT
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| The __ provide blood to lung tissue. | bronchial arteries
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| What are the pleurae? | Thin, double-layered serosa - parietal & visceral
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| The left lung has __ lobes while the right lung has __. | 2, 3
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| Intrapulmonary pressure | the pressure inside all alveoli is the same as that of outside air.
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| The __ help divide the thoracic cavity into the mediastinum, & lateral pleural compartments. | The pleurae - also limits spread of local infections.
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| Pleurisy | Inflammation of the pleurae - pleural effusion can result.
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| Pleural effusion | Fluid accumulation in pleural cavity
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