Explain the Internal structure of Heart ?
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The human heart is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline. The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane.
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yrrr
pehle he puchna tha, aaj biology exam ho gya hai, pehle pucha hota toh ek rivision ho jata :)
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