write function of left atrium of human heart (short answer)
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ᴛʜᴇ ʟᴇꜰᴛ ᴀᴛʀɪᴜᴍ ɪꜱ ᴏɴᴇ ᴏꜰ ᴛʜᴇ ꜰᴏᴜʀ ᴄʜᴀᴍʙᴇʀꜱ ᴏꜰ ᴛʜᴇ ʜᴇᴀʀᴛ, ʟᴏᴄᴀᴛᴇᴅ ᴏɴ ᴛʜᴇ ʟᴇꜰᴛ ᴘᴏꜱᴛᴇʀɪᴏʀ ꜱɪᴅᴇ. ɪᴛꜱ ᴘʀɪᴍᴀʀʏ ʀᴏʟᴇꜱ ᴀʀᴇ ᴛᴏ ᴀᴄᴛ ᴀꜱ ᴀ ʜᴏʟᴅɪɴɢ ᴄʜᴀᴍʙᴇʀ ꜰᴏʀ ʙʟᴏᴏᴅ ʀᴇᴛᴜʀɴɪɴɢ ꜰʀᴏᴍ ᴛʜᴇ ʟᴜɴɢꜱ ᴀɴᴅ ᴛᴏ ᴀᴄᴛ ᴀꜱ ᴀ ᴘᴜᴍᴘ ᴛᴏ ᴛʀᴀɴꜱᴘᴏʀᴛ ʙʟᴏᴏᴅ ᴛᴏ ᴏᴛʜᴇʀ ᴀʀᴇᴀꜱ ᴏꜰ ᴛʜᴇ ʜᴇᴀʀᴛ
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The left atrium receives the now oxygen-rich blood from the lungs and pumps it into the left ventricle. The left ventricle pumps the oxygen-rich blood to the body through a large network of arteries. The contractions of the left ventricle, the strongest of the four chambers, are what create blood pressure in the body.
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