type II
cells that secrete fluids containing surfactant
allows oxygen in the alveoli to dissolve and then diffuse
O2
diffusion
CO2
Gas Exchange
breathing system
Pneumocytes
type I
cells with small thickness of cytoplasm
lung cancer
abnormal cell growth causing tumors in lungs
smoking mainly, but also air pollution, exposure to radon gas, genetics
Ephysema
irreversible chronic disease because of the damage of the alveoli
smoking, chest infections, and air pollution
ventilation
maintaining concentration gradients
inhalation
alveoli in lungs
contraction of muscles
expiration
trachea
Intercostal muscle
Bronchi
bronchioles
alveoli
Diaphragm
