abdomen
alveoli
alveolus
artery
atrium
blood
body
bronchi
bronchioles
capillary
carbon
cell
cerebral
circuit
diaphragm
diffusion
dioxide
disease
exchange
external
gas
health
heart
human
internal
larynx
lung
membrane
metabolic
metabolism
mucous
mucus
muscle
oxygen
pleural
pressure
pump
respiration
respiratory
structure
system
thorax
tissue
trachea
troudh
valva
vein
ventricle