explain the structure of heart minimum 100 words
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heart is a pear shaped structure and has a membrane called preicardial membrane and between the two membranes a fluid is present called pericardial fluid which protects the heart from shocks and injuries and heart is divided into four parts externally by grooves
upper two parts are called atria and lower two parts are called ventricles.The blood vessels found in the walls of the heart are coronary vessels which supply blood to heart muscles and between left atria and ventricles bicuspid valve are present and right atria and ventricles tricuspid valve is present
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