muscle physiology

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okay so we did a lab on muscle physiology. acquired one small 2 cm length of psoas muscle . teased the bundle of muscle fibers into individual muscle fibers. aligned 3 individual fibers on each of three different microscope slides and placed 1 fiber on a fourth slide ( control)

measured the lenghts of each fiber.

then were given 3 solutions
A. .25% & ATP solution in distilled water
B. .25% ATP in water +.05 M KCI + .001 M MgCl2 in distilled water
C. .05 M KCI +.001 M MgCl2 in distilled water.

solution B gave the most difference in contraction length, then came C, A hardly. Why is this ?

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