chapter 1 fetal lung development Flashcards Preview

pediatrics > chapter 1 fetal lung development > Flashcards

Flashcards in chapter 1 fetal lung development Deck (23)
Loading flashcards...
1

what are the fetal lung development requirements

adequate surface area, pulmonary vascular systems ability to transport blood through the lungs, structure and elasticity

2

stages of lung development

embryonal
pseudoglandular
canalicular
saccular
alveolar

3

how long is the embryonal stage

week 1 - 8

4

when is the pseudo glandular stage

week 8-16

5

what lung developments occur during the pseudo glandular stage

conducting airways develop, pattern of lung structure is formed, cilia goblet cells, and mucus glands are formed, the epiglottis and the membrane that separates oropharnx is formed

6

when is the canalicular stage

week 17-26

7

what stage does fetal viability occur in and what week

canalicular stage week 22

8

what is developed (lungs) during week 20-22

type 1 and II epithelial cells, immature surfactant, and smooth muscle in conducting airways

9

when is the saccular stage

week 27 - 35/36 weeks & post term

10

when are alveoli seen

week 32

11

what occurs in the lungs during the saccular stage

alveoli epithelium and pulmonary capillaries merge, alveoli increase in number and size, mature surfactant

12

what occurs during alveolar stage

at birth alveoli are 20-150 million, and continue development up to age 8 increasing in size until growth of chest wall is complete

13

what factors affect lung growth

hypoxia, starvation, hyperoxia

14

what is pulmonary hypoplasia

lack of alveoli, not enough airways, olighydramnios (not enough amniotic fluid)

15

what can cause pulmonary hypoplasia

diaphragmatic hernia

16

what is the function of type I cells

allows for gas diffusion, and used as a barrier against water and solute leakage

17

what is the function of type II cells

surfactant production, storage and secretion

18

what is surfactant made up of

pc, pg, neutral lipids, and proteins

19

what law describes surfactant and what is its purpose

lap laces law; and to lower surface tension

20

when is surfactant inhibited

hypoxia, hypothermia, acidosis

21

how much fluid does fetal lungs secrete

250-300 ml per day

22

when are fetal lungs filled with fluid

cannicular period until delivery

23

what purpose does amniotic fluid serve

prevents traumatic injury, thermoregulation, fluid movement