heart sound

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Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

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Flags of the countries of the world (flagpoles).

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heart sound: Related Content

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Topics

heart rate heart murmur heart valve semilunar valve

Key People

Jean-Baptiste Bouillaud

French physician

Quiz

Male muscle, man flexing arm, bicep curl.

Facts You Should Know: The Human Body Quiz