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During Mongol occupation, which of the following became true for Russia?
Epicardium
The outermost layer of the heart wall, serving as a protective layer and a part of the heart's structure.
Heartbeat
The rhythmic contraction and relaxation of the heart muscles, pumping blood throughout the body.
Myocardium
The myocardium is the thick, muscular middle layer of the heart wall, responsible for contracting and pumping blood throughout the body.
Epicardium
The outermost layer of the heart wall, forming part of the heart's protective covering and contributing to the heart's lubrication system.
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