Chemicals & Human Health

Lung Toxicology Problem Set

Problem 4: Lung development

When do the alveoli develop in lungs in humans?

A. during the first 1-2 years of life
Human lungs are not completely developed at birth. The development of the alveoli continues after birth. New alveoli form by a process called septation. The existing alveoli grow new septa, or walls, leading to increased surface area.
B. in the 1-5th week of pregnancy
C. between 3 and 5 years of age
D. between 3 and 5 years of age
E. between 3 and 5 years of age

The Southwest Environmental Health Sciences Center
The Biology Project
The University of Arizona
Tuesday, October 14, 1997
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