Resp Embryology Flashcards
1
Q
embryonic
A
26 days - 6 weeks
respiratory diverticulum forms
initial branching = lungs, lobes + segments
2
Q
pseudoglandular
A
6-16 weeks
14 more generations of branching: terminal bronchioles
3
Q
canalicular
A
16-28 weeks
terminal bronchioles - greater than/= to 2 resp bronchioles
3-6 alveolar ducts
4
Q
saccular
A
28-36 weeks
terminal sacs form
capillaries = establish close contact
5
Q
alveolar
A
36 weeks - early childhood
alveoli mature
6
Q
typw 1 cells
A
blood air barrier
7
Q
type 2 cells
A
produce surfactant
8
Q
surfactant
A
prevents collapse of alveoli by reducing surface tension
9
Q
premature infants
A
too little surfactant
resp distress syndrome
20% newborn deaths
