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It is sometimes argued that using control groups is unethical because it can deprive participants of useful treatments. How do most research psychologists respond?
Pericardial Sac
A double-walled sac containing the heart and the roots of the great vessels, providing protection against infection and supplying lubrication for the heart.
Myocardium
The thick middle layer of the heart wall composed of cardiac muscle cells; responsible for the heart's contractile activity.
Epicardium
The outermost layer of the heart's wall, part of the heart's protective covering and involved in the production of pericardial fluid.
Endocarditis
Inflammation of the inner layer of the heart, often affecting the heart valves.
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