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Statistical studies in which researchers control variables of interest are
Pacemaker Cells
Specialized heart cells that control the heart's rate by generating and conducting electrical signals.
Left Atrium
One of the four chambers of the heart, receiving oxygen-rich blood from the lungs and pumping it into the left ventricle.
Right Atrium
The right atrium is a chamber in the heart that receives deoxygenated blood from the body through the vena cava and pumps it into the right ventricle.
Left Ventricle
The chamber of the heart that receives oxygenated blood from the left atrium and pumps it to the body through the aorta.
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