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Fill in the blanks- Heart has some rhyth...

Fill in the blanks- Heart has some rhythmic contractions and expansions, these are called___________.

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The process of dissolving an acid in water is a highly exothermic one. If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. The glass container may also break due to excessive local heating. Thus while diluting an acid it is recommended that the acid should be added to water and not water to the acid.
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