Q. 34.8( 5 Votes )

Choose the correct answer

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 chest cavity decreased
A. i

B. i & ii

C. ii & iii

D. iv

Answer :

When the diaphragm contracts, the volume of chest cavity increased and when it relaxes, the volume of chest cavity decreased increased. Thus it helps in breathing process.

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