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In the later 19th century, two countries began to surpass Britain in research, technical education, innovation, and growth rates:
Atria
The two upper chambers of the heart, which receive blood from the veins and pump it to the ventricles.
Ventricles
Chambers of the heart that receive blood from the atria and pump it out to the lungs and systemic circulation, or the central cavities in the brain that produce and store cerebrospinal fluid.
ECG Pattern
The visual representation of the electrical activity of the heart recorded by electrocardiography, showing the heart's rhythm and function.
Segments
Parts into which something is or can be divided or a portion of a larger structure designated by its function or location.
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