Sagot :
TRACHEA
-pathway of oxygen inside our respiratory system
-NEED BRAINLIEST ANSWER
When oxygen enters our nose, it passes through the nasal cavity . It passes to the phrynx and then to the larynx . Then the oygen continues to pass through the trachea down to the lungs. The bronchioles contain millions of aveoli. It also the sites of capillaries exchange between oxygen and blood.
( I'm not sure )
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