Frog skeletal muscle contains thick filaments that are 2.0um long and thin filaments 3.0 um long. If the uncontracted sarcomere is 4.0 um long, and the contracted sarcomere is 3.0 um long, what is the length of the I bands in micrometers before contraction?
A band before = [a] I band before = [b] A band after = [c] I band after = [d]

Expecting that the skeletal muscles of frog is like human beings (as they are vertebrates). The end drawn from this supposition that will be that the A band (thick fiber) stays unaltered in any event, during compression and the I band (flimsy fiber) contracts. So from the given data following outcomes are acquired;  

A band before = [2.0um]  

I band before = [2.0um]  

A band after = [2.0um]  

I band after = [1.0um]

explanation:

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