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Figure 3-22
Refer to Figure 3-22. Which of the four graphs illustrates a decrease in quantity demanded?
SA Node
The sinoatrial node, a group of cells located in the right atrium of the heart, acts as a natural pacemaker by generating electrical impulses that initiate each heartbeat.
Pacemaker
Cells of the sinoatrial node of the heart; electrical device designed to mimic the normal electrical patterns of the heart.
Hepatic Portal Vein
A vein that transports blood to the liver from the spleen and gastrointestinal tract.
AV Node
A part of the heart's electrical system that helps regulate the heart rate by delaying the transmission of electrical impulses.
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