7. Flood the fibers (situated under the stereomicroscope) with several drops of the solution containing ATP, K+, and Mg2+. Watch the reaction of the fibers after adding the solution. After 30 seconds (or slightly longer), remeasure each fiber and record the observed ending lengths on the chart. Calculate the percentage of contraction by using the simple formula below, and record this data on the chart. Initial \\ length (mm) \\ - ending \\ length (mm) = net \\ change (mm) then: $\frac{\text{net change (mm)}}{\text{initial length (mm)}} \times 100 = $ ____ % contraction
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