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the contracting and relaxing of muscle is regulated by the amount of calcium present in the cells of muscle fibers. these cells must be able to move to the calcium ions from areas with low concentrations
asked
Jul 11, 2017
Biology
high-school
2
answers
2
votes
16.7k
views
Recall that the length a spring streches varies directly with the amount of weight attached to it. a certain spring stretches 5cm when a 10-gram weight is attached write a direct variation equation relating
asked
Jan 15, 2015
Mathematics
middle-school
2
answers
3
votes
27.1k
views
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