TEST BANK For Neonatal And Pediatric Respiratory Care, 6th Edition By Brian K. Walsh

gm D Test Bank for Neonatal and Pediatric Respiratory
Care, 6th Edition
by Brian K. Walsh

,
, Chapter 1: Fetal Lung Developmen gm gm gm gm



tTest Bank
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MULTIPLE CHOICE gm




1. Which of the following phases of human lung development is characterized by the forma
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tionof a capillary network around airway passages?
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a. Pseudoglandular
b. Saccular
c. Alveolar
d. Canalicular
ANS:

The canalicular phase f
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ollows the pseudogland gm gm



ular phase, lasting from
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mapproximately 17 week gm gm



s to 26 weeks of gestati
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on. This phase is so na
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med because of the appe
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arance of vascularchann gm gm m
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els, or capillaries, which
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gmbegin to grow by form gm gm gm gm



ing a capillary network
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maround the air passages gm gm gm



. During the pseudogla
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ndular stage, which beg gm gm gm



ins at day 52 and exten
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ds to week 16 of gestat
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ion, the airway system
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subdivides extensively a gm gm



nd the conducting airw
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ay system develops, end
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ing with the terminal b
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ronchioles. The saccular gm gm



gmstage of development, gm gm gm



which takes place from gm gm gm gm



weeks 29 to 36 of gesta gm gm gm gm gm



tion, is characterized by
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gmthe development of sac
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s thatlater become alve
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oli. During the saccular
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mphase, a tremendous in gm gm gm



crease in the potential gm gm gm



gas-
exchanging surface area occurs. The distinction between the saccular stage and the al
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veolar stage is arbitrary. The alveolar stage stretches from 39 weeks of gestation to te
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rm.This stage is represented by the establishment of alveoli.
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REF: pp. g m gmgmg m 3-5

2. Regarding postnatal lung growth, by approximately what age do most of the alveoli tha
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t willbe present in the lungs for life develop?
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a. 6 months gm



b. 1 year gm



c. 1.5 years gm



d. 2 years gm




ANS: C gm

, Most of the postnatal formation of alveoli in the infant occurs over the first 1.5 years of
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life. At 2 years of age, the number of alveoli varies substantially among individuals. After
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2 yearsof age, males have more alveoli than do females. After alveolar multiplication en
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ds, the alveoli continue to increase in size until thoracic growth is completed.
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REF: p. 6 gm gm




3. The respiratory therapist is evaluating a newborn with mild respiratory distress due to tr
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achealstenosis. During which period of lung development did this problem develop?
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a. Embryonal
b. Saccular
c. Canalicular
d. Alveolar
ANS: A gm