doctors used stethoscope to hear the sound of the heart . why
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"Complete step by step answer: The stethoscope helps the doctor to hear sounds that are produced during each cardiac cycle. The next sound is heard when the semilunar valves close down after the blood flows into the vessels from the ventricles."
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ʏᴏᴜʀ ᴅᴏᴄᴛᴏʀ ʟɪsᴛᴇɴs ᴛᴏ ʏᴏᴜʀ ʜᴇᴀʀᴛ ᴡɪᴛʜ ᴀ sᴛᴇᴛʜᴏsᴄᴏᴘᴇ. ᴛʜᴇ ᴏᴘᴇɴɪɴɢ ᴀɴᴅ ᴄʟᴏsɪɴɢ ᴏғ ʏᴏᴜʀ ᴠᴀʟᴠᴇs ᴍᴀᴋᴇ ᴀ "ʟᴜʙ ᴅᴜʙ" sᴏᴜɴᴅ ᴋɴᴏᴡɴ ᴀs ʜᴇᴀʀᴛ sᴏᴜɴᴅs. ᴛʜᴇ ᴅᴏᴄᴛᴏʀ ᴄᴀɴ ᴇᴠᴀʟᴜᴀᴛᴇ ʏᴏᴜʀ ʜᴇᴀʀᴛ ᴀɴᴅ ɪᴛs ᴠᴀʟᴠᴇs ᴀɴᴅ ʜᴇᴀʀ ʏᴏᴜʀ ʜᴇᴀʀᴛ's ʀᴀᴛᴇ ᴀɴᴅ ʀʜʏᴛʜᴍ ʙʏ ʟɪsᴛᴇɴɪɴɢ ᴛᴏ ʏᴏᴜʀ ʜᴇᴀʀᴛ sᴏᴜɴᴅ
ʜᴇʀᴇ ɪs ᴜʀ ᴀɴsᴡᴇʀ ʜᴏᴘᴇ ɪᴛ ᴡɪʟʟ ʜᴇʟᴘ ᴜ
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