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biology 0610printed 146 · PDF 146
328 pagesrevision 46933
printed 146 · PDF 146
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146
External intercostal muscles contracts
External intercostal muscles relax
Ribs cage is pulled upwards and
outward
Ribs cage drop downwards to its normal
position
Pressure inside falls below atmospheric
pressure
Questions:
MCQ’s:
1.
2.