Problem $13$: Upper motor neuron disorder patients can benefit and regain useful function through the use of functional neuroprostheses. The design requires a good understanding of muscle dynamics. In an experiment to determine muscle responses, the identified transfer function was $($Zhou$,1995).$ Find the unit step response of this transfer function.

$M(s)=\frac{2\mathrm{.}5e^{-0\mathrm{.}008s}(1+0\mathrm{.}172s)(1+0\mathrm{.}008s)}{(1+0\mathrm{.}07s{)}^2(1+0\mathrm{.}05s{)}^2}$