MCQ
Eustachian tube connects.
- AInternal pharyax.
- BExternal ear with internal ear.
- CMiddle ear with pharynx.
- DExternal ear with middle ear.
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| Alveolar Air | Atmospheric Air | |
| $p O _{2}$ | $ X$ | $ Y$ |
| $pCO _{2}$ | $A$ | $B$ |