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Q.

Which of the following is correct?

i) The diaphragm contracts - volume of chest cavity increased.

ii) The diaphragm contracts - volume of chest cavity decreased.

iii) The diaphragm expands - volume of chest cavity increased.

iv) The diaphragm expands - volume of abdominal cavity decreased.

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a

i

b

i & ii

c

ii & iii

d

iv

answer is A.

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