Systole of the left ventricle is directly caused by: (Select all correct answers, there may be one correct answer, or more than one correct answer)     The firing of a single SA node     The firing of a single AV node      The firing of an AV node on the left side of the heat (anatomical left)     The firing of an SA node on the left side of the heart (anatomical left)

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Q: complete blockage of the LAD. B

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