3d
air
alveoli
alveolus
anatomical
anatomy
bacteria
biology
body
breathing
catarrhalis
coccus
concept
conceptual
diplococci
gram negative
health
human
illustration
infection
internal
lungs
medical
medicine
microbe
microorganism
moraxella
pathogen
pathology
physiology
pneumonia
realistic
respiration
respiratory
science
spherical
system
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