Definition: The term "leptocardii" refers to a type of heart valve that is characterized by its circular shape and an irregular, oval-shaped opening in the valve's chamber. These valves are found in the lower chambers of the heart, specifically the left atrium (the right side of the heart) and the left ventricle (the left side). Leptocardii can be either open or closed, depending on whether they allow blood to flow from one side to the other without being blocked
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