Select your answer:

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Pulmonology/Respiratory › ViewWhere is the site of oxygen exchange and elimination of carbon dioxide?
A. bronchus
B. sternum
C. aveoli
D. intercostal space
Normal Radiographic Anatomy › View
The structure pointed at by the arrow is …, while the RL hallow above it is
A. mental ridge, mental fossa
B. mental ridge, mental foramen
C. mental ridge, mandibular canal
D. external oblique ridge, mental fossa