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Explain the four different types of economic systems, and provide one example of a country for each.
Papillary Muscles
Muscle projections from the ventricular walls of the heart that attach to the chordae tendineae and prevent inversion of the valves during contraction.
Atria Contraction
The process during the cardiac cycle where the atria chambers of the heart contract to move blood into the ventricles.
Pulse Pressure
The difference between systolic and diastolic blood pressure, indicating the force that the heart generates each time it contracts.
Ejection Phase
This is the part of the cardiac cycle during which the ventricles contract and pump blood out into the arteries.
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