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3 / 12  Which element is important in directly triggering contraction?
A  sodium (Na + )
B  calcium (Ca ++ )
C  potassium (K + )
D  chloride (Cl - )

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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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