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QUESTION
Q39) Pick the correct statement ... [ Kerala 2010 ]

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The contraction of the external intercostal muscles causes an elevation of the ribs (inspiratory breathing muscles) whereas both the internal and innermost intercostal muscles lower the ribs (expiratory breathing muscles).
RBC’s transport Co2 also
Healthy man inspire about 5 -6 litre of air per minute


Answer : (c)