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Residual volume

The residual volume of air in the lungs
a.is the amount expelled on a normal expiration
b.remains until the chest cavity is opnened
c.is also called the minimal air volume
d. is the amount forcefully exhaled
e.is also known as the complemental air

We know that it's not a or c, but a different question was what major air volume is left in the lungs after forcibly exhaling and we came up with residual volume so I think we are a little confused on terminology. Thanks!

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RESIDUAL VOLUME OF AIR IN THE LUNGS

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The residual volume of air in the lungs
a. is the amount expelled on a normal expiration
b. remains until the chest cavity is opened
c. is also called the minimal air volume
d. is the amount forcefully exhaled
e. is also known as the ...

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