Question

amount of air that remain always trapped in respiratory passage is called

Answer 1

The amount of air that remains always trapped in respiratory passage is the residual volume. It is an amount of air that allows diffusion of gases to continue between pulmonary blood capillaries and alveoli even after a forced exhalation. 
Dead space volume represents an amount of air that does not participate in gaseous exchange because it is retained in the respiratory tract, and can not reach vascularised alveoli.


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Answer 2

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Amount of air that remains always trapped in respiratory passage is called dead space.



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