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
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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