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The “lub” is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second sound,” dub” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.
Answer:cuz you lose a lot of water a lot like when you breath or sweat and stuff and yea
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are u sure this question is correct
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B. The nervous system is responsible for controlling and coordinating all of the body
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