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14 / 49  Contraction of the external intercostal muscles causes which of the following to occur?
A  The diaphragm moves downward.
B  The rib cage is compressed.
C  The thoracic cavity volume decreases.
D  The ribs and sternum move upward.

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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