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5 / 30  Which of the following is unique to cardiac muscle cells?
A  Only cardiac muscle contains a sarcoplasmic reticulum.
B  Only cardiac muscle has gap junctions.
C  Only cardiac muscle is capable of autorhythmicity
D  Only cardiac muscle has a high concentration of mitochondria.

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Source:  OpenStax, Human biology. OpenStax CNX. Dec 01, 2015 Download for free at http://legacy.cnx.org/content/col11903/1.3
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