Muscle basic difference?

Question

what are the basic differences among striated, nonstriated and cardiac muscle?

Answer 1

Basic... striated muscle is striated because the fibres are all lined up. Thus, the actin and myosin are aligned and you see stripes. "Nonstriated" (smooth muscle) has no striations because the fibres are not aligned perfectly. They are not aligned purely randomly, as some people/books may tell you - they are more or less aligned with the cell, but they are organized randomly. So, the Z lines do not line up and you do not see striations. The advantage of this is that smooth muscle (SM) can contract much more than cardiac/skeletal muscle (ie. the striated muscles): SM contracts to about 20% of its length, whereas skele/card muscle can only contract to about 80% of its original length.

More advanced... I won't go into it in detail, but there are molecular differences between smooth and skeletal muscle. For example, skeletal muscle uses troponin and tropomyosin. But smooth does not have troponin, and instead has tropomyosin, caldesmon, and calponin. There is also more actin in SM, and SM has longer actin and myosin filaments. Smooth muscle is also different from the others because it uses calmodulin, which activates the myosin light chain kinase and allows contraction.

Answer 2

idk. cardiac is heart muscle, dats all i noe