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25 November, 01:52

Which of the following produces the first heart sound?

The closing of the valves between the ventricles and the body

The opening of the valves between the atria and the ventricles

The closing of the valves between the atria and ventricles

The opening of the valves between the ventricles and the body

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  1. 25 November, 05:01
    0
    Hey. The first sound is the "lub." This is what you hear once the mitral and tricuspid valves of the heart close, which are the valves between the atria and the ventricles! Super cool. It is your third answer choice.
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