2. An instrument used by doctors to check heartbeat.
3. An exception of artery.
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Answer:Your doctor listens to your heart with a stethoscope. The opening and closing of your valves make a "lub dub" sound known as heart sounds. The doctor can evaluate your heart and its valves and hear your heart's rate and rhythm by listening to your heart sounds.
Artery, in human physiology, any of the vessels that, with one exception, carry oxygenated blood and nourishment from the heart to the tissues of the body. The exception, the pulmonary artery, carries oxygen-depleted blood to the lungs for oxygenation and removal of excess carbon dioxide (see pulmonary circulation).
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