The figure below shows how a pacemaker aids in the regulation of a human heart. 
As a result of step 3 in this figure,
A) the atria are in systole.
B) the right side of the heart is in diastole.
C) both the atria and the ventricles are in systole.
D) the ventricles are in systole.
Correct Answer:
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Q17: Which of the following statements about the
Q18: Which of the following is true of
Q19: In the human heart, atria pump blood
Q20: Which of the following blood pressures would
Q21: The pressure needed to move blood from
Q23: Arteries and veins, which transport materials over
Q24: Which of the following is not a
Q25: This figure depicts blood pressure in different
Q26: Which of the following would have an
Q27: Which of the following statements about open
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