Cardiac motion creates an audible sound. This sound is one of the chief diagnostic tools of medical professionals and is a part of a patient's vital signs.? The first heart sound is made by the closure of the atrioventricular valves at the beginning of ventricular systole. This is usually vocalized by health professionals as “l(fā)ubb”.?? The second heart sound, which has a higher pitch, is made by the closure of the semilunar valves during ventricular diastole. This is usually vocalized as “dupp”.

??注釋： ??cardiac motion /?kɑ?d??k ?m????n/ 心臟運(yùn)動 ??audible /???d?bl/ 聽得見的 ??diagnostic tool /?da??ɡ?n?st?k ?tu?l/ 診斷工具 ??medical professional /?m?d?k?l pr??f???n?l/ 醫(yī)學(xué)專業(yè)人員；醫(yī)學(xué)專業(yè)人士 ??vital sign /?va?t?l ?sa?n/ 生命體征；生命征 ??closure /?kl????/ 關(guān)閉；倒閉 ??atrioventricular valve /?e?tr???v?n?tr?kj?l? ?v?lv/ 房室瓣 ??ventricular systole /v?n?tr?kj?l? ?s?st?l?/ 心室收縮(期) ??vocalize /?v??k?la?z/ 說出；發(fā)聲 ??health professional /?h?lθ pr??f???n?l/ 保健專業(yè)人士；衛(wèi)生技術(shù)人員 ??lubb-dupp; lub-dup; lub-dub /?l?b?d?p/; /?l?b?d?p/; /?l?b?d?b/ 心跳聲的擬聲詞 ??pitch /p?t?/ 音高；音調(diào) ??ventricular diastole /v?n?tr?kj?l? da???st?l?/ 心室舒張(期)