Class 7 Science Important Questions
Extra Questions for NCERT 7th Science Solutions
NCERT Books Class 7 science Questions
NCERT based sample Questions
How does the size of chest cavity decrease?
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Class 7 Science Important Questions
Extra Questions for NCERT 7th Science Solutions
NCERT Books Class 7 science Questions
NCERT based sample Questions
The size of chest cavity decreases when:
(i) the ribs move down and inwards and
(ii) diaphragm moves back up to its former position.