What stimulates the Hering-Breuer inflation reflex?
a. The DRG when it is time to end inspira-tory efforts.
b. The stretch of receptors at high lung vol-umes.
c. The VRG when it is time for inspiration.
d. Very low lung volumes stimulate inspira-tion.
ANS: B
In adults, the Hering-Breuer reflex is activated only at large tidal volumes (800 to 1000 ml or more) and, apparently, it is not an important control mechanism in quiet breathing.
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