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Which muscles help us to increase the strength of expiration?

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Important Questions on Breathing and Exchange of Gases

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The breathing rate of a normal healthy man is
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What is the value of tidal volume in a normal healthy man?
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What is the main site of human respiratory system where exchange of gases occurs?
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Partial pressure for oxygen and CO2 is represented as
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What will be the pCO2 and pO2 in atmospheric air as compared to alveoli respectively?
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What is the value of pCO2 in atmospheric air, alveoli and tissues respectively?
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The volume of air that remains in the lungs after a normal expiration is: